briefly:
Have three DCs. DS1 is 9, other DCs are 3 year old twins. DS1's biological father lives nearby. He sees DS every other weekend and one evening a week. Had to convince him to be involved in the early days (unplanned pg from slightly unhealthy FWB scenario), they are close now.
I am now married to a great guy who's been in DS's life since day one (he was my best mate), and considers DS his own son. DS calls him dad.
We all live in an area with good primary schools but absolutely rubbish secondary schools. DS's father said that if we settled in this area, where he already owned his home, he would pay half of private school fees when DS got to secondary school age (plan was we'd move before the twins got to secondary school).
We bought our flat. Market crashed, we are in huge negative equity, DH's industry shaky - we can't move for a few years at least.
DS's father got a girlfriend and decided they were going to move out of our city together. He said that he was going back on the agreement re: school fees and DS could either stay with me or he would pay for him to go to a fee-paying school wherever they settled (planning Manchester, near his DP's family).
I said no (and other choice words). He then suggested he and his DP buy in the home counties (we are all in London). He said they would move near good schools and suggested DS live with them in the week during termtime and attend school there.
I was pretty desperate by this point and said I would consider it. They started looking for houses. Then his DP left him. He went a bit mental TBH, very clingy with DS, started demanding more access.
That was a year ago. He maintains that he will move to the home counties near a good school and is expecting that DS will go with him.
I have pretty much no intention to go through with this. His ex DP was a nice girl who encouraged him to spend more time with DS and made massive changes to his lifestyle. Now she's gone he's back to barely leaving the house, he plays his consoles or is on the computer all the time. DS is given takeaways, they never go to the park or anything, it was a battle to get him to agree to take DS to his judo lessons on sat mornings.
But DH and I truly cannot move, plus the twins are all set to go to the (excellent), primary DS is at. We don't have a hope of paying any percentage of school fees and DS isn't bright enough to get into a grammar or get a scholarship.
The local secondary schools are utterly crap. But I think a stable loving home, help with homework, maybe we can get him help with exams going forward. I think it's better for DS than living with his bio father miles from everyone he knows and going to a good school.
At war with myself though because I went to private school (which I hated - but it did get me good results and a good job, same with DH). Can't stand the idea that I might be handicapping DS, but... he should be with his mum, dad and brothers, surely?