How to deal with my brother in regards of our mom`s money?

My brother has a difficult angry temper since always. He and I manage our mom`s money since oru dad died. But since she is an elder, she can't really handle her own money otherwise she will waste it on non necessary things or loose the money or lend money (without telling us) to who knows who, that is how my mom got caught in several bank debts after my dad died and she never told us anything about it, when she handle the money herself. Sofrom those bank problems (that we still are paying) we decided our mom is not fit to manage her own money (the one dad left her) otherwise she will end up with no money in a minute.

So my brother and I are the ones in charge and we tell her in what things we are using her money, so she can know what is the money been used for, (utilities, and other house or things for herself as well and other house expenses).

My brother is aware that since we are in charge of that money and we can go to the banks to withdraw mom`s money or with a debit card, he says he is aware , he can't use that money for his own benefit or his own personal stuff, Im also aware of that myself. But he has a different perspective on what things the money can be used for and I have another view. I mean always realted to house stuff. For him there are things that are priority to use the money for immediately and can't wait for medium or long term (house maintenance, car issues). Probably for my brother some things are urgent, important or priority to use the money for and can't wait while others can wait to use the money for but then I disagree maybe if for my brother some things are priority for me they are not and they can wait for some months in order to use the money. So we always argue and discuss about it. For my brotehr he believes im a cheap or stingy because i live saving money on things. But the thing is that we are not millionaire either but what my mom receives each mom has to last one month, while is not little money, it is not a lot either.
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My brother says he knows that the money will last and even we have some to spare of each month, beacuse we are managing the money well. It has happened in the past, each end of the month there is always some money left (after all the house expenses are paid) but that does not mean we are rich. We have an older married sister but she does not help financially in the house anyway is not her house and I guess she has no obligation to help in a house she does not even live on even if our
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mom lives with us on it. So my brother and I always discuss about the money, he says the money will last if it is spend in this or that that I should not worry, and I always says otherwise beucae an expense could wait for other months not right away. My brother works as a dental technician, but he does not earn very good, and what he earns he is paid like once each month, so if he wants to help in the house he can't do it on big expenses.
How to deal with my brother in regards of our mom`s money?
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