Sharing selected devices in TUYA - managing permissions for family members

Hello, and I have a question about making the control of some devices within a family available only to one user while keeping the control of all devices on the other app. The idea is that I, as administrator, can control all devices while my son would only have access to selected ones. I have the TUYA CLOUD and I have the TUYA APP on both smartphones. I added my son to the family, but he has control of all devices. When I removed them from him and added one device, the one he was supposed to have, it disappeared with me.

You have to give him access to the devices you want.

Many thanks for the hint although I had to search for it. For others I'll hint, it's in the app after selecting the device in question and selecting the pencil in the top right-hand corner. When you open it there is an option to share the device.