As they were separated he was not entitled to remove anything from the house. Had they been living together he may have had an entitlement and that would depend on whether your mother made a will before her death. If she had a will her estate is distributed according to the will. If she didn't the estate is distributed in accordance with the law of intestate succession and you should be applying to the sheriff court to have yourself appointed as executor. You can then have the legal right to demand the return of the estate, by court proceedings if necessary. Happy to discuss further. I hope that helps. Please leave a positive rating so that I am credited for my time.