Help my Sissy and brothers child

I want to help my brothers girlfriend out. My brother and her just got a newer van, just moved into an apartment like a month ago, and my brother was sarahs other financial support. They just lost their son this year as well.  My newphew Seth Eric Mullin, had complications at 6months old and Sarah had to delivery the baby. They named him and hes an angel now. My brother passed suddenly on September 13th 2018. Luckily he gave sarah most of his money for the bills and all and the rent.  My birthday is October 2nd and i would like to donate money to my sissy in law and my niece Hayleigh.... my brother was her father.  She called him daddy and was the only “daddy” she knew! He loved her so dearly and I know my brothers in heaven with seth and all my other loved ones i lost and is at peace.....please share and only donate what u can afford im not looking for hand outs or charity, because i know my brother is with us and God is good and will make her okay. Ill be helping her with money along the way as well!!!