Oh, That makes more sense.. I do think you can talk to your children and explain that unless they can get up on Sunday mornings with no complaints, they will need to go to sleep (it can be in your bed) but at a set time.
Every once in a while our daughter would beg to stay up late. I would let her know it was fine, but she needed to get up in the morning and get ready for school just like any other day and I did not want to hear any excuses..
This is one of those times You give your children ownership for their own decisions and they will learn that they cannot blame others if they make a decision that does not work out.
Do keep in mind, children thrive on a schedule, rules and guidelines. They want to know what is going to happen next. The easiest way to do this is to have some sort of schedule, so they have that "safe feeling" and know what is expected and what will be happening next.
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"(We are homeschooling so they won't have to get up early for school.) "
Really? This is why you are homeschooling? Most people I know that homeschool do it because they want their children taught a certain curriculum. Or they do not have schools that meet their expectations in their neighborhoods and cannot afford private school.
As long as it does not bother you and your husband, and you have your own schedules, why change?
Just let them know on Saturday nights, they need to go to bed by
8:00 - 8:30 in their own room, because you all have to get up early to go to Church on Sundays. And since what you are doing right now is not working on Sunday mornings, you all need to do this, unless they quit complaining on Sunday mornings.