Question after my mom's passing, need advice on a bank account.

I would like some opinions on a question I have. My mother passed away two weeks ago and my husband and myself were her caregivers she lived alone and we did everything for her so she could stay in her own home all appts grocery shopping ect. My sisters (I have three) came two to three times a year. One of those sisters called every day and talked to her, the other called her on Sunday night. Both of those sisters were nice to her and treated her well. The last sister hadn’t seen her for three years and actually had told her last summer she was a horrible mother after learning I had received the house. The question is, my mother had me on a bank account as co-owner, would you share this money with both of the nice sisters or all three even the mean one? Oh also the mean sister tried to get my mom to send her a big check after she told her off which she didn’t. They are already sharing in a life insurance settlement and a small account. What would you do? Thanks much.