Mother recently passed. I am the Executrix, house rite of survivor. Only other assets are in Joint bank accounts with me. Do I have to probate ?

I am the Executrix of my mother's will. House left to me with rite of survivorship. In will my brother/sister get portion of estate. The only other assets are joint bank accounts with my name and her name on them. I have taken her death certificate to the bank to notify them of her passing. According to what I have read, the accounts (since joint) do not go into the estate. I will give my brother/sister some money from the account, but do I have to probate since there is not a true "estate"?