Poor you. I don't blame you for being angry, I would be too. I can't believe how selfish his other children are being, and it isn't fair on your dd's. You're a complete star for agreeing to have him. Hope it isn't too awful.
What a bl**dy nightmare, sobernow - very much sympathy, useless though it is. Very on your behalf. My Mum cared for her schizophrenic older brother for 20 years (he lived with us and died when I was 15). She had 3 other sisters and another brother and in all that time notone of them offered to have him to stay so she could have a break (and she had my brother and I to look after too, obviously)
Actually, I tell a lie - one sister had him for a week once when we went on holiday. When Mum asked again a few years later she said she couldn't as he was "too disruptive" to their family life...
Is it a chain of dry cleaners? If so I'd double or treble the cost of the dress, if not i probably wouldn't. You could buy your dds something nice for them to have as an heirloom instead, and keep the bolero jacket either for one of them to wear, or to be cut up and made into something else (a hairpiece? corset top?) that would be significant for them on their wedding days. You could keep it in a box with the photo from the local paper.
Oh sobernow, what a crappy day
I would definitely take the cleaners to the cleaners and maybe use the proceeds to fund a family treat once you have offloaded the old pig.
Remember you are saints and will be rewarded in Heaven for this really altruistic act...