It is somewhat difficult to addres your question with the limited information you have provided. The first thing you need to determine is whether your brother left a will. If he left a will, it will answer your question. The person or persons named in his will as his beneficiaries will receive any assets he owned at the time of his death.

If he did not leave a will, then he died intestate. In this situation, a Probate Court in the county in which he died will order his assets distributed to his "heirs at law." This is simply his living relatives.

If he left a wife, she would inherit. If he left children, they would inherit. Otherwife, his siblings would inherit. If there are three siblings and you are one of them, you would receive one third of his estate.

The terms of the governing document of his pension will determine whether he has after death benefits. If so, he most likely named beneficiaries at the time he became eligible for the pension. If he did not name beneficiaries for the pension and there are after death benefits, then the funds will go into his estate for distribution to his estate beneficiaries.

There is insufficient information here to address the question of your sister and her filing bankruptcy