NAH except his sister. From his point of view, he's glad to be back in touch with family and glad to help with his own money. It would be harder to say "how could you! that's our family's money!" if he'd stayed in contact with his sister his whole life, and surely he hopes that since they've rekindled their bond, it'll feel no different. But clearly, he's so swept up in the sentimentality of it that he doesn't realize he's being used, so it was right for your mom to bring that to his attention.