Mine all grown up now but best I can remember - they follow daycare schedule when small. Their own bedrooms never been used for daycare. Because it their home as well as business building, their personal toys were kept in their bedrooms and they would nap in their own beds.
Any toys coming out of their bedroom had to be shared but we have daycare toys and personal toys and I never mix those.
As they got to Elementary school, they spend time in the house away for client child if they want. Their rooms remained their sanctuary. They were allowed snack after school of their choice but if they eating a meal with daycare children they get same as daycare children. Own children also allowed to grab drink from fridge as this their home and daycare children not allowed do that because set meal times in daycare.
Also if mine want to watch TV or play video games after school, they allowed to do that. It was not in the main daycare room. They had been school all day and allowed time unwind in their home just like daycare children allowed unwind in their own home at end of their day.
It little different where you carer's children same age but I don't think it unfair let older child go upstairs and watch TV and exclude daycare children. I have no screen time in my daycare and we not had TV for many years now boys all gone but I would not expect own children to have to entertain/accomodate client child once mine in school.
My children were not daycare staff, and not friends of the daycare children but expected to be friendly to them but they allowed escape to own room, out of daycare space when school done without having children hanging around with them.