It is very difficult to say no, but you have to, if you feel that way. We have had GS 3 days a week, when my daughter was part time, but when she decided to go full time, we certainly didn't offer to do the other 2 days. although it seemed almost expected. My daughter made choices, we don't mind helping, but she has to take responsibility. It is true that with having to pay 1 day childminder (Dad has GD the other day) her extra 2 days work are not as lucrative. But as much as we love GS, we just need our time. There were the usual talk of well, hardly worth it with childminder, not sure it will be worth it, but we took no notice. Our DD's generation is very good at trying to have it all, childminder fees a problem but gym membership and take aways don't seem to be. So only do what you would enjoy doing. Anything more and you will resent it, the children will pick up on it and it will end badly.