My mother has got Alzheimer`s. She has gold jewelry and my father wants to give it to charity on her behalf. Is it conditioned that her sons and daughters should approve of this and is his doing so permissible?

My father is sick and I think that he falls within the category of those whose actions aren`t recorded since he suffers from cerebral atrophy and has sustained several strokes. Nevertheless, he is still alive and has granted me a general power of attorney. When he got sick for the first time, I sold his house and bought him another next to mine. The rest of his money are either deposited in  banks or invested in different projects. Recently, I have sold a plot of land in the West Bank. I did so because it would be difficult to prove that it is his in case he passed away. All my brothers know about this for we have agreed to divide its price amongst all the heirs. Is it permissible to do the latter while our father is still alive?