Once the game reloads, a pop-up should appear listing the "My Son’s GF" mod under the "Script Mods" or "Custom Content" section. You can then enter a household and check for new social interactions under the "Friendly" or "Romance" categories to ensure the mod is active.
If you’re looking to add this to your gameplay, here is a straightforward guide on the installation process, requirements, and troubleshooting.
This usually happens when you have conflicting mods (like UI Cheats or MC Command Center). Make sure all your major mods are updated simultaneously.