Bear with me. NC as a regular and can't give out too many identifying details.
DP has difficult relationship with his DF. His childhood was not good. DFIL and DMIL split when DP was v young and DMIL left. DFIL and DMIL haven't spoken since. Bad behaviour all round to put it mildly. DP did not know how to clean his teeth at 9. DP put in 'remedial' classes even though not stupid, classed as 'lazy' in school reports. DP has never heard his dad approve of him or say he is proud (though we know FIL boasts about him to others)
There is a DSMIL and DSCs (last one flown nest recently).
DP has turbulent relationship with DF. he does not behave well when around him. There is regression to power struggles from way back. DFIL is bombastic, dresses up insults in joshing, criticises, controls and manipulates every situation. This causes conflict between me and DP when we are with them.
Now we have DCs, I've found him more and more difficult. There is a culture of blame in the family. I've been accused of all sorts over the years, but the last time we stayed I vowed to go NC.
One of our DCs is in assessment for ASD/ADHD (he doesn't know this). this DC is impulsive, hyperactive, boisterous, and oppositional. Always has been. Other DCS similar but not so much. FIL has got very angry in past about DC1 not eating what he has cooked, and refused to let DC1 make choices about it (like giving gravy or ketchup when there is no way in hell would eat it). Apparently 'in my day you were glad to get food'. DPs younger siblings don't have a great relationship with food (understatement).
Anyway we (me) are bad parents, let him 'get away' with things, DC1 is going to end up in jail, we are abusing DC1 because we don't make DC1 have milk at every opportunity (8YO!), we shouldn't let him have chocolate, we can't ask HIM not to give DC chocolate, etc etc.
Also DP has told me some of the things he says about me, and "when are you going to get rid of that fucking bitch and get someone younger in" is just one example, of a great many.
After our last visit DP had a call from FIL saying we weren't welcome there, that we were bad parents, and worse.
DP has had to speak to his DF since because otherwise he would be unable to speak to other members of family. Also DF started leaving nasty messages etc when he didn't return calls. FIL rings him regularly and talks about himself, never asks about his GCs. I haven't spoken to him for over a year.
They are staying in our city this week. They want to see GCs. I have said DP should take them to see them one night and I won't go. I don't want to stop them seeing GPs. I don't want him in my house, I don't want to see him, and I don't really want to speak to him because I know I might be rude to him - and I'd be the bad guy then. I don't want to be in the presence of FIL and DP as DP regresses to a teenager, and is desperate for approval.
He has called me a couple of times now to try and arrange to see DCs, and I haven't picked up and I don't know what to do. I don't trust myself to speak to him TBH. I don't want to come out of this as the obstructive one either. I want to be the sensible one. Trouble is I'm a bit ground down by the DC behaviour and I fear I will be cast as 'highly strung and paranoid' anyway if I see them. I can't tell them about what we are going through with DC1 because they are proven sceptics of mental health issues.
There is form for him phoning me, having a 'reasonable' conversation, then calling DP and saying what a bitch I've been.
Do I have to suck it up and be nice to him as its DPs battle?
I thought if he caught me on the phone I might just be honest and smile as I say 'I think it best you see the DCs without me, we don't always get on do we?" but not sure I can pull it off.