---
title: "Add an existing owner or a family-only contact"
method: POST
path: "/families/{id}/members"
tags: ["Families"]
---

# Add an existing owner or a family-only contact

`POST /families/{id}/members`

## Request

- Base URL: `https://ledgerhq.pro/api/v1`
- URL: `https://ledgerhq.pro/api/v1/families/{id}/members`
- Auth: one of:
  - HTTP bearer and API key in header `x-organization-id`
  - HTTP bearer and API key in header `x-organization-id`

Firm-side family relationships only. Select the firm with x-organization-id. Owners, Admins and Staff Admins access all firm families; Staff Members need independent family assignment. Company access does not grant family access. OAuth requires the broad mcp grant, not a narrow banking scope; API keys retain ordinary agent permission scopes. No accounting organizations, portal grants, bank changes, invitations or charges are created. Writes require ordinary firm write entitlement. Cross-firm and inaccessible IDs return 404.

## Path parameters

- `id` string, uuid, required

## Request body

- union: Select ownerId explicitly when an email matches an existing owner. New-contact input never silently replaces entered details. Adding an owner can link a matching family-only contact while preserving its name and mobile.
  - object
    - `ownerId` string, uuid, required
  - object
    - `name` string, required
    - `email` string, email, required
    - `mobilePhone` string

## Response `200`

Success

- object
  - `success` boolean
  - `familyId` string, uuid

## Other responses

- `403`: Firm staff or required permission missing
- `404`: Record not found or not accessible
- `409`: Archived family, last-member removal, identity conflict, already-linked member, explicit owner selection required, or redundant administrator assignment

---

[API](https://skmtc.dev/ledgerhq-pro/apis/ledgerhq-bookkeeping-api.md) · [All operations](https://skmtc.dev/ledgerhq-pro/apis/ledgerhq-bookkeeping-api/llms.txt) · [OpenAPI document](https://skmtc.dev/ledgerhq-pro/apis/ledgerhq-bookkeeping-api/revisions/9a8269f0a586?raw)