Ok - so who is allowed in the family bathroom? How does that work? Is it a single bathroom with one toilet? If that’s the case, there’s going to be one heck of a lineup.
Walmart has family bathrooms. It is a large handicapped single occupancy bathrooms.
It is named so that Mom can go to the bathroom and have her boys in the bathroom with her instead of looking under stalls, or Dad can take the daughter to the bathroom and help her. It is advertised as letting disabled people have help of the opposite gender. And if it was a single person of indeterminate gender, no one cares.
And Walmart does have full sets of womens’ and men’s bathrooms.