Very little is known about Peter, as he was only referred to in one episode, when Tom announces to his mother, who suffers from dementia, that both his brother and their sister Theresa agreed that she should be put in a nursing home. Allison isn't happy with their decision, worrying that she'd live out the rest of her days alone.
Peter Scavo grew up as the son of Allison and Rodney Scavo. Peter is also the brother of Tom Scavo and Theresa Scavo. Not much is known about Peter's life except his family background and that he cares for his mother who has dementia. It is unknown if Peter is married. ("Excited and Scared")
Tom Scavo wants to put his mother, Allison into a nursing home because she has dementia and nearly got hurt on Halloween. Tom mentions to his wife Lynette, and his mother that he called his brother and sister, Peter and Theresa to ask how they felt about this and they all agree that Allison belongs in a nursing home. ("Excited and Scared")