It's very frustrating to have so much family within minutes of me and yet no one will take either kid even for just a while, my husband won't take either kid for a while, it has been months since I've had a break and that break was to have Vivian. I know there are lots of moms that do it without any time to rest but it sure is not easy.
My ex MIL was famous for only wanting to take my oldest when it was convenient for her... So I stopped that for a few times (you don't babysit when I ask, you don't babysit at all) and it ended up in her taking her every weekend and even during the week. I'm a little more protective of my youngers.
As for the husband. "Oh honey, I just put the baby down for a nap and we need 'x' from the store, if I take Andrew it'll just take me so much longer because of the car seat, I'll get you a Dr. Pepper.' Which usually helps the deal. Lol I think my negotiation skills are honing.
Do they nap at the same time? Hugs Amy.