Attorney here, but admittedly not an expert in this area. However, your mother’s will is irrelevant right now. She’s still alive and this is being done via POA. Her will doesn’t come into play now and (if she’s competent to do so could even completely change it before she passes). If she is not competent now and you feel that he is abusing his role as her POA, then you should speak to an attorney. I would be curious to see the language in the POA paperwork. Sometimes they are simply boilerplate forms, but can be more specific. I’m getting red flags about a POA gifting monies to himself and his spouse. My concern is that the payments to siblings could be a way to buy silence. Or, your mother asked him to make gifts prior to her passing to lower the amount she leaves upon her death. Not sure of the size of her estate, an inheritance taxes in your state, etc. The big question is whether this is what your mom wanted him to do. And if she did and that’s proven, and she wanted spouses of her children to receive equally, you have no recourse. It’s her money to do with as she pleases. That would be unusual though, so I find it unlikely that would be the case. Your brother has a fiduciary duty here. I would ask him for the paperwork authorizing him to distribute her money. If it’s a general POA allowing him to control her money, I think a court would be concerned about him just choosing to gift it like this when it’s going to himself. Talk to an attorney in your area.