My wife's parents set up a trust for both their children and grandchildren. However, the trust has different rules for my wife and her sister, and her sister's son and daughter. My wife and her nephew have to petition the trust to use any money and it can be denied if the trust deems the reason not good enough, whereas her sister and niece have free use of the money (or rather, her niece will when she turns 25; I think she's 21-22ish now). I'm glad we have the money! I'm very grateful to my wife's parents! But it has definitely caused some resentment due to the unequal treatment and clear view of who is responsible or not.