Try this in your family

Agree which apps are available before handing over the phone.

Set the time limit together and make it visible.

Explain that Parent Mode stays private.

Use the same return routine each time.

Consistency matters more than perfection. A routine becomes easier when the words and sequence stay familiar.

Where Shellimit can help

Set the time and available apps before the handover, then let the visible limit support the boundary you have already explained.