Hello and thanks for using Just Answer.
My name is ***** ***** am happy to assist you with your enquiry, and am sorry to hear of your losses.
As your brother was alive at the date of your Mother passing, his Estate is entitled to half of your Mother's Estate.
Your brother's half share then goes to his next of kin (if he did not leave a Will) or to whoever is his beneficiary under his Will.
If your brother did not leave a Will, his next of kin would be in this order-
His wife, but if he was not married
his children, but if he had no children,
So, if he wa snot married and had no children, you would be his next of kin and be entitled to his half share of your Mother's estate.
I hope this assists and sets out the legal position to you.
Please let me know if you need any clarification.