It took us a while to come up with an equitable schedule, but I alternate back and forth between the ladies. For example:
Monday - Marie
Tuesday - Jo
Wednesday - Marie
Thursday - Jo
Friday - Marie
Saterday - Jo
Sunday's used to be a family day when we would get together with the kids and grandchildren, enjoy a meal at Jo's place (it's bigger) or we would go out to eat at a local restaurant, but while we go out once a month, the ladies requested that I split the day between them. So now I go to church with Marie and have lunch with her, then I head over to Jo's around dinner time and spend the evening there.
Now of course nothing is written in stone, and the ladies frequently trade days for Dr's appointments and birthdays, etc. so I can be with them.