Sorry for the long post - didn't expect it to be so long!
I'm prepared to be told IBU as I'm an (almost) stepmum but here you go.
For background, been with my partner for 4 years, we are getting married this summer. We moved into his apartment three years ago (his mum owned it and he was renting it) and two years ago bought our own place. He has two children from his first marriage - two boys who will be turning 18 and 16 next month. 18 year old left school at 16 and has been working a full time job since. Makes decent money for his age and has good savings as his only outgoing are his socialising, clothes etc. 16 year old is about to take GCSEs and will then do A Levels. They live with us 50/50, so week at ours, week at mums. I get on well with the kids.
When my partner first got divorced the ex left their home and moved in with the man she had been having an affair with and my partner had the children five nights a week every week. This went on for around five years however they did start staying at their mums a bit more after that (at my insistence to be fair) and when we moved it went to 50/50 as we now live half an hour away and it was a lot for my partner to pick up and drop off twice a week (he does all the PO/DOs).
Anyway because of the arrangement we were stuck in a very limited area we could buy our home two years ago as had to be near the boys' school and we live in London. So we have a three bed flat which while it's lovely is still a flat and I've always dreamed of owning a house with a nice garden. Unfortunately we can't afford that in the area that we have to live.
OH had agreed with me that in two years with the youngest SS is 18 and has left school (oldest will be about to turn 21 at this point) we can move out of London so I can finally own my dream house and garden. I was hoping 18 year old would go to uni so it would be ok as he could visit in holidays and obviously also stay with his mum who will be in London in the same town. However now he has said he wants to take a gap year and I can see it becoming an issue us moving out as he will still be living at home and wouldn't want to leave friends etc.
Would I BU to still push for the move? Oldest would also cause a fuss (he's said he wants to live with us til 21) but I will have already sacrificed five years living somewhere I don't want to live by that time and I feel it's fair that we get equal say. I pay half the mortgage and bills.
Best scenario would be 18 year old live with his mum full time when he leaves school so we can move but she will kick up a fuss as she is very regimented about 50/50 and doesn't like to have her children full time (I'm not saying that to be bitchy but it's the truth). But what 18/20 year olds want to be packing a suitcase every week to move house anyway!?