What happens in memory unit or dementia facility after the families leave? any way to tell?

Ask the facility: All medical facilities have protocols in place.You should ask them directly what are they going to do with your relative.

Ask facility first: You can ask the facility -- there're always some sort of activities going on and schedule is usually posted. Talk to the coordinator or rn, or administrator. If your concerns are not resolved and the facility is not receptive to your questions, there're departments of public health that inspect the facility and investigate complaints. But check with the facility first.