Well, if they were underage I'd think this had merit. But these are family get togethers. If you want to do a cruise with your own family then you need to consider that you and your husband both have baggage. Take him on vacation without anyone else.
Take your 2 kids and have a family vacation. She's not their mother. She won't be there.
His kids are not your kids. They are her kids and if they want their mother to come on vacation with them then you don't really have a say.
I do understand that you helped raise them but she is their mother. I'm sorry that seems rude. But you are acting like these adults are your children and she shouldn't go on vacation with her own children.
As for church, you can always get up and move. Let hubby sit by her if he wants.
When I do family things with my ex and his wife I sit with them, I talk to his wife, I like her. I went to high school with her but didn't know her personally back then.
People are amazed at us. They find out he's my ex and that we haven't had any disagreements since right at the time of our divorce. He lived with her 2 years before I filed for divorce. I didn't believe in divorce but was completely fine with living apart. I didn't care that much about the whole thing.
We get along. They do things with my daughter that I don't go to. They take her, her husband, and her kids out to eat and to activities and I don't have to go along.
BUT we have had family Christmas time, we've had weddings and they've invited me to church and I sat with them, I have gone to pretty much every church they've ever gone to because they invited me or my daughter invited me, and I sat with them every single time.
When some of the grand kids were in foster care we had all 4 families get together at the foster family home. My ex, his wife, the grandson they've had since he was a few months old, me, my husband, the granddaughter and grandson we've raised since they were nearly born, my daughter and her youngest, and the foster family with the 2 grand kids they had plus all the foster kids they had in their home at that time.
There wasn't one word of anger, not one raised voice except those trying to visit over the kids squeals and running amok, and we had an excellent day. The foster family told us later that they had DHS on stand by to "drop by" and help out if it got out of hand. The foster mom told me that she and the DHS worker had talked about our visit afterwards and in all their years working with kids in the system they'd never been witness to 4 families, with kids in the system, being able to get along much less have a very enjoyable happy day.
So it can be done.
Do they go do stuff without me? Yes. Do I do stuff without them? Yes. But the big stuff we always end up doing together.