It would be very interesting to see, attached to each different opinion, who has been through this and dealt with the consequences, and who has not.
These threads are always 99% full of people saying that no self respecting adult would accept the money, yet in real life I know of nobody who has ever turned down money from a relative, just doesn't happen.
Not the same situation for me and it's a long story, my dad basically took my db and I off his insurance policies and added his step son and my half sibling. I was 10 and my db 8 when he took us off.
Db and I knew nothing about this until two years after he died, I had my suspicions as step bro went from bailiffs at his door the week of his funeral to planning a multi thousand pound wedding two weeks after the funeral. I don't care that I didn't get any money, I really don't, I'd cut contact with step family long before I found out about it, but it hurt, it really did, it was another example of my Dads shitty attitude, he always slagged my mum off, he always said she wasn't for to look after us (she was fucking brilliant and he never helped financially or otherwise) yet he was happy to take steps to make sure that we wouldn't also be looked after, if something were to happen to him, ifbhebrealky thiught my mum was an unfit wrecklessly mum he'd have made sure he left us looked after too.
Getting no money isn't what hurt, it was the way they went about it and the way they revealed it, I cut contact for other reasons and then when my db stopped running up their arse stepmum said dad didn't love us and left them all this money as proof, that she had to force him to visit us on the few occasions he did, that my mam is a slag etc etc.
Dads siblings were just as shocked and I think they told her she was out of order and maybe pressured her to put things right. I dunno but a cheque arrived from her, life changing money for me, I ripped it up (felt good doing it too) and never looked back, my db also ripped his up, I've managed all my life without fuck all from my Dad and no way was I giving stepmum any kind of influence over my life. She'd be all over Facebook taking any credit for anything good that happened to me.
I didn't ask dh what he thought before ripping it up, but he's seen the damage my Dads attitudes and (lack of) parenting have done to me and wouldn't want me having to feel thankful or greatful to any of them. No material objects are worth having any reminder of them in my life.
Different to the OP situation I know, but just wanted to share that yes, sometimes people do turn down large amounts of money when they giver will likely use it as a means of guilt tripping, control etc