Wealthy people regularly give large cash gifts to family to decrease their taxes. Whether that is noble or not is not for me to decide.
As for them giving to charities, that is a good thing, regardless of what motivates them to do it. The fact is that countless strangers will benefit from their charity.
As for me personally, if I have any money left to give to my girls, yes, they can have it. I can't take it with me. Unless they have done something awfull. Then their share will go to the other children. But I will give to my sister's children equally. Their parents have supported me and helped me out when no one else would.
As for giving to charity personally. Once I am in a position to, I will do everything I can to advocate battered/abused women and children.