Firstly, I know DP and I aren't married but for the sake of simplicity I will refer to DP, DSS, MIL etc.
Secondly there is a back story that I really dont want to go into.
Ok, so just to try and summarise:-
Been with DP for 6 years, I have 2 DS 14 & 18, he has 1 DS almost 13. DSS lives FT with DP at MIL/FIL (they have a huge house near a very good school) and has very little contact with his mother (she appears to be happy with this - hasn't seen him since Xmas and the only time she asked to see him then decided to go out and cancel at the last minute).
Prior to DSS moving with his Dad 2 years ago, DP was living with me however when DSS came to live with DP he didn't want to live here (various reasons) so they moved in with MIL/FIL and we've kinda muddled along for the last 2 years. It's not been easy. It's not the relationship I wanted and there have been times when I've questioned whether I want to live like this for who knows how long.
Cut to now - due to DP, MIL & FIL all being key/essential workers, DP & DSS have been staying with me more during Covid lockdown. Whilst DSS doesn't exactly need full time childcare, DP didn't want him being left at home on his own for 8-10 hours a day and as I'm WFH most of the time it seemed the easiest option. I dont have a problem with this, DSS initially wasn't happy but we've now settled into a routine of sorts and he's accepting of the situation. The constant asking when he's going to be able to stay at his Nans has subsided, he accepts he stays there when he's told and things are generally getting easier.
This is partly whats caused my issue - I really like DP being here more and I dont want to go back to how things were before - him staying here 2-4 nights a week sometimes with, sometimes without DSS (more with DSS during school hols). It's not possible for DSS to move in here once schools are back as he cant get to school from here. We cant move somewhere together as it's too expensive to purchase or rent a 4 bedroom property in this area. I cant move closer to MIL/FIL as then my sons couldn't get to school.
Is it unreasonable to consider him moving back in here at some point and DSS staying with MIL/PIL? DP has changed jobs so in theory DSS could stay here every Thurs - Sun or would that be too much disruption to school? DSS is almost 13 and a part of me thinks when he chose to live with his Dad he knew his Dad lived with me and then forced his Dad's hand because he didn't want to stay here. But another part of me thinks he's not yet 13 and his mum (although I'm sure she loves him) has been a bit crap with contact since he moved out so would he see this as his Dad also abandoning him? But then at what point, if ever, would DP be able to say to DSS - I'm moving back in with CBA, you're welcome to come, you're welcome to stay with MIL/PIL.
Whole situation is a mess really isn't it?