La Familia Mansion is MBRoberto’s XML-to-YMAP conversion of the Devin Weston house, with a garage added in the 2020 release. Its title mentions FiveM, but its written installation steps describe GTA V single-player tools and archive edits.
What the source actually documents
The instructions use OpenIV to place the YMAP into a custom-map archive, then Map Editor for access markers. This is not a complete FiveM server installation procedure, and a YMAP conversion should not be described as a new MLO interior without supporting package evidence.
Before using it on a server
Inspect the downloaded files for a resource manifest and required assets. If they are absent, obtain a documented compatible package or plan a permitted conversion. Do not invent a resource name or copy single-player archive instructions into server.cfg.
On a separate test setup, inspect entry and exit routes, doors, the garage and overlap with other Devin Weston edits. Keep the original download and map configuration. A creator preview establishes appearance in that setup, not compatibility or performance on your server.