I, too, think your offer is very generous. However there are some things that come to mind that you need to think about long and hard and discuss with dh before making a decision. Many of these have been mentioned by other posters.
1. What if you and dh decide you would like to take a spur of the moment vacation?
2. What if you or dh get sick and can't watch the kids? What if one of you is hospitalized? What if one of you requires a lot of care once you are at home recovering from illness/surgery? What if another family member needs your help?
3. If ddil gets a new job, she most likely will not have a lot of vacation and may not be able to request certain times off that would coincide with your vacation.
4. I would not let ddil dictate when you and dh get to go on vacation.
5. The HOUSE. While it may be a "beautiful" house, etc., it may turn out to be more than she can handle on her own--financially and with upkeep. They may not need such a big home now that she is going back to work and your ds is not living there. Sounds like it would be better to find a smaller home for her and the two kids in a nice neighborhood that would be within her budget and would allow her to find daycare. Then you
could be her backup daycare instead of primary daycare. You could take care of the kids when they are sick, the other sitter is gone, emergencies arise, etc. That would allow you to still travel and do your other things.
6. Don't give up your entire life just so she can remain in a house! You need to have time with your friends and to do the things that you want to do as well. You need to feel free to take off and leave with your dh as you want. You do not want to become resentful or feel tied down--not saying that you would, but it could happen.
7. Your ddil needs to meet you partway on this. Yes, her life is changing. She needs to look at it realistically and do what she needs to do. If they move, they will miss the "house" for awhile, but they can make the new house into their home. That would help her budget--mortgage and living expenses, allow her to find daycare, allow you to watch your gk's occasionally and still have your life.
8. I also agree that your ds needs to help out with some weeks/days when the daycare provider cannot watch the kids.
Please don't be "guilted" into anything since it was your ds who left. They--ds and ddil--are adults and have to make their own choices. You have raised your children and now should be able to enjoy your grandchildren without being pressured to help out on ddil terms. It seems like "staying in the house" is a big concern. As others have stated, there are other houses within her budget that they could move into. They will all adjust and move on.
JMHO
