A list of every single relative of Ron's family, aside from being very long, is unknown. However his immediate family are as follows (italics means in-law):
Parents: Arthur and Molly Weasley.
Brothers: William 'Bill', Charlie, Percy, Fred (deceased), George Weasley and Harry Potter.
Sisters: Ginny (Weasley) Potter, Fleur (Delacour) Weasley, Audrey Weasley, Angelina Weasley.
Wife: Hermione (Granger) Weasley.
Children: Rose and Hugo Weasley.
Nieces: Lily Luna Potter, Victorie, Dominique, Molly, Lucy and Roxanne Weasley
Nephews: James Sirius Potter, Albus Severus Potter, Louis and Fred Weasley.
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Charlie, Bill, Percy, Fred (desecased) and George. He also has a brother in law; Harry Potter.
William 'Bill' Arthur Weasley. Charlie Weasley
Percy Ignatius Weasely
Fred Weasley
George Weasley
Ginerva 'Ginny' Molly Potter nee Weasley.
Charlie, Bill, Percy, Fred, George and Ginny. He also has three sister in-laws; Fleur, Audrey and Angelina. As well as one brother in-law; Harry.
March 1, 1980
Ron weasleys father and molly weasleys wife.
The secret of Ron Weasley's rat is Wormtail. Scabbers(Ron's rat) transforms into Wormtail, the person who sold Harry Potter's parents to Voldermort.
Ron's relationship is brother-in-law with Harry and very good friends. Ron has six siblings. Bill, Charlie, Percy, Fred, George, and Ginny.
Probably because his family despises:* Anybody who is half-blood or muggle - or, as in the case of the Weasleys, who works in favor of them. What they call a "blood traitor". * Anybody who is in house Griffindor. * People who worked against Lord Voldemort. * People who are poor.