In my divorce agreement, it states that if a parent cannot parent on parenting time, they are to ask the other parent first before finding an alternative for childcare. Perhaps you should amend the agreement to say that.
Why is it you have the weekdays and he has the weekends? we had it where my ex had her on the weekends due to the nature of my job, and him not wanting to take week nights. I ended that after a certain incident I won't get into, but I wanted to also enjoy time spent with my daughter at birthday parties and stuff. Even though I worked 3 night shifts a week and I was home with her during the week, no one else was home. I wanted weekend time. So we made a compromise.
Your divorce agreement is amendable when something is not working. And V is right. it is OK to say no.
Oh, and I also have a clause in the agreement where no one is to bad mouth the other parent to child. Your child should get just as much of a chance to be with your family, as much as his, but only if they are not talking about your R and M with your child.
Hang in there, and it's time to set some reasonable boundaries.
