I am so sorry for your loss and for the problems here. Generally speaking, if you were the joint tenant on the account then you would have inherited the funds at the time f your Mother's death and the funds would NOT be part of the probate of your Mother's estate.  They would pass to you automatically under the "rights of survivorship" laws. So if you were a joint tenant with rights of survivorship then no, you do not have to give them copies of the statements.  Good luck.