I've NC for this as it's instantly identifiable to my family . Could get long.
Df has never been a hands on dad and was actually quiet shit on being a good role model. Who ever he was married to at the time got his full attention. His current wife I actually really like. If it wasn't for her I probably wouldn't even half the half hearted attempt at a relationship with DF. But I'm ok with this I'm used to it.
They are unfortunately going bankrupt . They have lost their house but have yet to hand the keys in. They are living in rented accommodation. Their house was lovely and Dsm really looked after it. It was her home.
Dp and df did a deal for a sum of money and shook hands on it, it was that dp could have what he wanted out of the house for some of his property's, radiators,boiler, kitchen units,washer dryer ect.... When dp arrived at my df old house,df stated if you see anything else you want take it.
While my dp was there they took down the kitchen and then he returned leaving FIL there with the keys.
My df rang me two days later saying Dsm was horrified at the state of the house. She was in tears . She was shocked that they had taken more things that she assumed they would take. But she was distraught at the damage FIL had caused.
He had ripped the fire place off leaving plaster hanging of walls, taken the radiators but not drained them spaying water and soaking all the carpets through with black water. Woodwork was smashed to pieces. Apparently it looks like some one took a hammer too it. I haven't seen it but I believe it.
It's took a full day to clear it up.
FIL doesn't give a shit about anyone. He is incapable of feeling empathy for anything/person.
Dp and fil see it as 'well they have lost the house, they don't live there now,what's the fuss' 
They can not understand that this is a fucking awful thing for them to lose there lovey home and now some one has gone in and trashed it needlessly. Dsm was devastated. They had fucking drills and common sense. They didn't have to rip it pieces and make such a mess.
I think it's really hitting Dsm that she has lost her home now.
The damage was done while dp wasn't there but I'm ashamed to admit dp would probably would have left it that way too .
I'm starting to see traits in dp that are in his df and I hate it. We have had a massive argument this morning saying terrible things about each other's family's . Tbh if they had done it to a random stranger I would still feel the same. It was brutish , insensitive and thoughtless. It's really rocked the foundations on which our relationship is based on as dp is usually a very caring person or is that quality only afforded to me?
Any thoughts?