This man is the husband of Penny's Maternal Grandmother. He is the father of Susan and the father-in-law of Wyatt. He is the maternal grandfather of Penny, Randall and Lisa. He is the ex-maternal grandfather-in-law of Zack Johnson and the current maternal grandfather-in-law of Leonard Hofstadter and Lisa's Husband. He is a great-grandfather to Penny's Nephew. Penny's Uncle may be his possible son. Penny's Cousin may be his possible grandson.
He is indirectly mentioned after Professor Proton asks Penny if she has any single grandmothers and she answered that both grandmother's were married.
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