Anonymous wrote:OP, I think you've gotten some good advice on dealing with your MIL. So, here is my unsolicited piece of advice about Legoland (please take with a grain of salt!).
I'm not sure how old your preschooler is, but we went this summer with our 4 kids, then ages 8, 5.5, 3.5, and 7 months. The older 2 had a blast, but the younger two could only really hang out in Duplo land. It was fun for the 3.5 year old for the morning, but by the afternoon she was beat. I ended up wrangling 2 young, cranky kids while DH & the older 2 had a blast. Based on my experience, you might find putting this whole vacation off for 3-4 years might be more fun.
BUT, that aside, I agree- the issue about how to handle not ever being able to leave MIL alone is a big one, and definitely needs to be addressed now. What if you had a compelling reason to all be somewhere else at another time?
Good luck sorting this out!
+1 to all of this. The Legoland will wait, your DS sounds a little young for it yet, and leaving your MIL for a whole weekend with a stranger might be a goal to work up to, rather than something to do right now. But I totally understand that you want to take a vacation! Separately, sit your DH down and ask him very seriously what would happen if you were incapacitated. God forbid, what if a medical issue arises with you or one of the kids and you have to be in the hospital? Emergencies happen. It wouldn't take much to get in a fender bender, sprain your ankle, kid spikes a high fever, etc. You're much better off having a caregiver familiar to your MIL who can step in. Ideally you would have a caregiver service once a week so your MIL can get used to a few elder-sitters, and then you will have someone to call. If your DH doesn't see this, he is being unreasonable.