diff --git a/src/index.ts b/src/index.ts
index 8b28222..ed03aaf 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -5,8 +5,12 @@ type RouteInfo = {
   path: string
   file: string
   name: string
-  parent?: string // first pass parent is undefined
-  isIndex: boolean
+  parentId?: string // first pass parent is undefined
+  index?: boolean
+  caseSensitive?: boolean
+}
+interface RouteManifest {
+  [key: string]: RouteInfo
 }
 
 type DefineRouteOptions = {
@@ -49,7 +53,7 @@ export default function flatRoutes(
   baseDir: string,
   defineRoutes: DefineRoutesFunction,
   options: FlatRoutesOptions = {},
-) {
+): RouteManifest {
   const routeMap = new Map<string, RouteInfo>()
   const parentMap = new Map<string, ParentMapEntry>()
   const visitor = options?.visitFiles || visitFiles
@@ -59,8 +63,8 @@ export default function flatRoutes(
     path: '',
     file: 'root.tsx',
     name: 'root',
-    parent: '',
-    isIndex: false,
+    parentId: '',
+    index: false,
   })
   var routes = defineRoutes(route => {
     visitor(`app/${baseDir}`, routeFile => {
@@ -117,7 +121,7 @@ function getRoutes(
   if (parentRoute && parentRoute.children) {
     const routeOptions: DefineRouteOptions = {
       caseSensitive: false,
-      index: parentRoute!.routeInfo.isIndex,
+      index: parentRoute!.routeInfo.index,
     }
     const routeChildren: DefineRouteChildren = () => {
       for (let child of parentRoute!.children) {
@@ -125,7 +129,7 @@ function getRoutes(
         const path = child.path.substring(
           parentRoute!.routeInfo.path.length + 1,
         )
-        route(path, child.file, { index: child.isIndex })
+        route(path, child.file, { index: child.index })
       }
     }
     route(
@@ -180,7 +184,7 @@ export function getRouteInfo(
     file: path.join(baseDir, routeFile),
     name,
     //parent: parent will be calculated after all routes are defined,
-    isIndex:
+    index:
       routeSegments.at(-1) === 'index' || routeSegments.at(-1) === '_index',
   }
 }
@@ -190,6 +194,10 @@ function appendPathSegment(url: string, segment: string) {
     if (segment.startsWith('_')) {
       // handle pathless route (not included in url)
       return url
+    } else if (segment.endsWith('_')) {
+      // handle parent override
+      segment = segment.substring(0, segment.length - 1)
+      url += '/' + segment
     } else if (['index', '_index'].some(name => segment === name)) {
       // handle index route
       if (!url.endsWith('/')) {
@@ -211,5 +219,6 @@ export type {
   DefineRouteFunction,
   DefineRouteOptions,
   DefineRouteChildren,
+  RouteManifest,
   RouteInfo,
 }
diff --git a/test/__snapshots__/index.test.ts.snap b/test/__snapshots__/index.test.ts.snap
index 84a2501..f4094be 100644
--- a/test/__snapshots__/index.test.ts.snap
+++ b/test/__snapshots__/index.test.ts.snap
@@ -1,5 +1,87 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`define routes should allow routes to specify different parent routes 1`] = `
+Object {
+  "routes/parent": Object {
+    "caseSensitive": undefined,
+    "file": "routes/parent.tsx",
+    "id": "routes/parent",
+    "index": undefined,
+    "parentId": "root",
+    "path": "parent",
+  },
+  "routes/parent.some.nested": Object {
+    "caseSensitive": undefined,
+    "file": "routes/parent.some.nested.tsx",
+    "id": "routes/parent.some.nested",
+    "index": undefined,
+    "parentId": "routes/parent",
+    "path": "some/nested",
+  },
+  "routes/parent.some_.nested.route": Object {
+    "caseSensitive": undefined,
+    "file": "routes/parent.some_.nested.route.tsx",
+    "id": "routes/parent.some_.nested.route",
+    "index": undefined,
+    "parentId": "routes/parent",
+    "path": "some/nested/route",
+  },
+}
+`;
+
+exports[`define routes should correctly nest routes 1`] = `
+Object {
+  "routes/app.$organizationSlug": Object {
+    "caseSensitive": undefined,
+    "file": "routes/app.$organizationSlug.tsx",
+    "id": "routes/app.$organizationSlug",
+    "index": undefined,
+    "parentId": "root",
+    "path": "app/:organizationSlug",
+  },
+  "routes/app.$organizationSlug.edit": Object {
+    "caseSensitive": undefined,
+    "file": "routes/app.$organizationSlug.edit.tsx",
+    "id": "routes/app.$organizationSlug.edit",
+    "index": undefined,
+    "parentId": "routes/app.$organizationSlug",
+    "path": "edit",
+  },
+  "routes/app.$organizationSlug.projects": Object {
+    "caseSensitive": undefined,
+    "file": "routes/app.$organizationSlug.projects.tsx",
+    "id": "routes/app.$organizationSlug.projects",
+    "index": undefined,
+    "parentId": "routes/app.$organizationSlug",
+    "path": "projects",
+  },
+  "routes/app.$organizationSlug.projects.$projectId": Object {
+    "caseSensitive": undefined,
+    "file": "routes/app.$organizationSlug.projects.$projectId.tsx",
+    "id": "routes/app.$organizationSlug.projects.$projectId",
+    "index": undefined,
+    "parentId": "routes/app.$organizationSlug.projects",
+    "path": ":projectId",
+  },
+  "routes/app.$organizationSlug.projects.$projectId.edit": Object {
+    "caseSensitive": undefined,
+    "file": "routes/app.$organizationSlug.projects.$projectId.edit.tsx",
+    "id": "routes/app.$organizationSlug.projects.$projectId.edit",
+    "index": undefined,
+    "parentId": "routes/app.$organizationSlug.projects.$projectId",
+    "path": "edit",
+  },
+  "routes/app.$organizationSlug.projects.new": Object {
+    "caseSensitive": undefined,
+    "file": "routes/app.$organizationSlug.projects.new.tsx",
+    "id": "routes/app.$organizationSlug.projects.new",
+    "index": undefined,
+    "parentId": "routes/app.$organizationSlug.projects",
+    "path": "new",
+  },
+}
+`;
+
 exports[`define routes should define routes for complex structure 1`] = `
 Object {
   "routes/_auth": Object {
@@ -120,7 +202,7 @@ Object {
     "id": "routes/app_.projects.$id.roadmap",
     "index": undefined,
     "parentId": "root",
-    "path": "app_/projects/:id/roadmap",
+    "path": "app/projects/:id/roadmap",
   },
   "routes/app_.projects.$id.roadmap[.pdf]": Object {
     "caseSensitive": undefined,
@@ -128,7 +210,7 @@ Object {
     "id": "routes/app_.projects.$id.roadmap[.pdf]",
     "index": undefined,
     "parentId": "root",
-    "path": "app_/projects/:id/roadmap.pdf",
+    "path": "app/projects/:id/roadmap.pdf",
   },
 }
 `;
diff --git a/test/index.test.ts b/test/index.test.ts
index bff0eb9..fca1501 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -1,4 +1,5 @@
 import { defineRoutes } from '@remix-run/dev/config/routes'
+import type { RouteManifest } from '../src/index'
 import flatRoutes from '../src/index'
 
 describe('define routes', () => {
@@ -69,6 +70,32 @@ describe('define routes', () => {
     expect(routes).toMatchSnapshot()
   })
 
+  it('should correctly nest routes', () => {
+    const routeList = [
+      'app.$organizationSlug.tsx',
+      'app.$organizationSlug.edit.tsx',
+      'app.$organizationSlug.projects.tsx',
+      'app.$organizationSlug.projects.$projectId.tsx',
+      'app.$organizationSlug.projects.$projectId.edit.tsx',
+      'app.$organizationSlug.projects.new.tsx',
+    ]
+    const routes = flatRoutes('routes', defineRoutes, {
+      visitFiles: visitFilesFromArray(routeList),
+    })
+    expect(routes).toMatchSnapshot()
+  })
+  it('should allow routes to specify different parent routes', () => {
+    const routeList = [
+      'parent.tsx',
+      'parent.some.nested.tsx',
+      'parent.some_.nested.route.tsx',
+    ]
+    const routes = flatRoutes('routes', defineRoutes, {
+      visitFiles: visitFilesFromArray(routeList),
+    })
+    expect(routes).toMatchSnapshot()
+  })
+
   it('should ignore non-route files in flat-folders', () => {
     const flatFolders = [
       '$lang.$ref/_layout.tsx',
@@ -107,3 +134,53 @@ function visitFilesFromArray(files: string[]) {
     })
   }
 }
+
+type RouteMapInfo = {
+  id: string
+  path: string
+  file: string
+  index?: boolean
+  children: string[]
+}
+function dumpRoutes(routes: RouteManifest) {
+  const routeMap = new Map<string, RouteMapInfo>()
+  const rootRoute: RouteMapInfo = {
+    id: 'root',
+    path: '',
+    file: 'root.tsx',
+    index: false,
+    children: [],
+  }
+  routeMap.set('root', rootRoute)
+  Object.entries(routes).forEach(([name, route]) => {
+    if (!route.parentId) return
+    const parent = routeMap.get(route.parentId)
+    if (parent) {
+      parent.children.push(name)
+    }
+    routeMap.set(name, {
+      id: name,
+      path: route.path,
+      file: route.file,
+      index: route.index,
+      children: [],
+    })
+  })
+  const dump = (route: RouteMapInfo, indent: string) => {
+    const getPath = (path?: string) => (path ? `path="${path}" ` : '')
+    const getIndex = (index?: boolean) => (index ? 'index ' : '')
+    output += `${indent}<Route ${getIndex(route.index)}${getPath(
+      route.path,
+    )}file="${route.file}"${route.children ? '' : ' /'}>\n`
+    if (route.children.length) {
+      route.children.forEach((childId: string) => {
+        dump(routeMap.get(childId)!, indent + '  ')
+      })
+      output += `${indent}</Route>\n`
+    }
+  }
+  let output = '<Routes>\n'
+  dump(routeMap.get('root')!, '  ')
+  output += '</Routes>\n'
+  console.log(output)
+}