Legal Question in Real Estate Law in Pennsylvania

If he had no spouse or children, his mother would be his legal heir.

I assume you mean that he did not have a Will. I also assume that he was a resident of Philadelphia PA.

His mother may probate his estate by going to the office of the Register of Wills in City Hall. The staff there will tell her what to do. She will need an original death certificate, and her own ID.

THIS RESPONSE IS NOT LEGAL ADVICE, SINCE I DO NOT HAVE ALL OF THE INFORMATION THAT WOULD BE REQUIRED, AND I DO NOT HAVE A REPRESENTATION AGREEMENT WITH YOU.

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