I've been going round in circles googling this so if anyone can advise I'd be grateful…
DH's Nan is now very elderly and recently DH was asked to go round and sign some documents regarding her will as her solicitor has suggested both him and his Dad are appointed to manage her estate when she dies (FIL in his 80's himself)
SIL recently left her husband of 20+ years, divorced and has married her affair partner. DH asked SIL to make sure the divorce included a financial order so exBiL can't try and claim any proportion of her inheritance and she assured him everything was done.
It has since transpired that this was a lie and exBiL "didn’t sign everything" (whatever that means) and she accepted as was the only way he would agree to the divorce and she was in a hurry to remarry. She is sure that because she is now remarried he can't claim anything from her?
Obviously if she silly enough to not tie everything up properly and loses some of her inheritance that's her business but what would be the implications to DH who will be dealing with the estate, he's not experienced with these things at all exBiL - is very money grabbing (he has form for tricking money out of family members and as a couple they lost friends over money) and from a finance background so he knows his stuff. DH is worried he's going to end up involved in a lengthy legal battle he doesn’t really want any involvement in.