I'm inclined to agree that's where the ultimate responsibility lies, but whoever owns the dog that does the big damage would surely feel some responsibility and want to contribute ( as indeed was the case here).
My guess is that the situation is also wrapped up with the Mum staying at the house when it's not ideal thing. I love my mother dearly, but truly I think mothers and daughters don't live well together as adults. Short term yes, but tensions quickly start to simmer even with mums and daughters who are very close.
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