grandtanteJE65
This issue needs to be addressed in the broader context of a talk with your husband about his and your expectations of retirement.
What you both, or the one or other of you want to do when you retire and most importantly what your finances are going to be.
Now is also the time to discuss whether you intend to remain in your present home, or downsize, and whether either of you , or both of you wants to travel and see more of the world before you become too old to enjoy doing so.
At some point you can then introduce the subject of whether you and your husband still can be so generous regarding the "children's" visits.
But don't lead with their visits and who pays for them, as it sounds like an emotional minefield to me.
Included in finances could be how each intends to spend their 'fair share' of all savings and incomings. Assuming all couples have ways to divide assets and incomes to suit themselves - do that.
I certainly don't spend on my husband's hobbies, he surely doesn't spend on my hair, we each have pots of disposable money.