Below is a list of everyone Magneto is related to. It took me a while, but I think I finally got all of them. Though, if you guys can think of anyone else, give me a heads up.
As an aside, God help us all if Polaris ever marries her long time boyfriend Havok. If that happens, the Summers family tree will connect with Magneto's, which will make him related to pretty much everyone in Marvel Universe.
Red Lucy is a distant ancestor of Magneto.
Jakob is Magneto's father
Edie is Magneto's mother
Erich is Magneto's uncle
Ruth is Magneto's sister
Magda is Magneto's wife
Anya is Magneto's daughter
Quicksilver is Magneto's son
Scarlet Witch is Magneto's daughter
Django is the adoptive father of Quicksilver and the Scarlet Witch
Marya is the adoptive mother of Quicksilver and the Scarlet Witch
Susanna is the mother of Magneto's daughter, Polaris
Polaris is Magneto's daughter
Zaladane is Susanna Dane's daughter and Polaris's half sister
Joseph is Magneto's clone
Luna is Magneto's granddaughter
Wiccan is Magneto's grandson
Speed is Magneto's grandson
Vision is Wiccan and Speed's father
Jeff Kaplan is the adoptive father of Wiccan
Rebecca Kalan is the adoptive mother of Wiccan
Jocasta is Wiccan and Speed's aunt (She was built by Ultron, the same being who built their father, Vision)
Victor Mancha is Wiccan and Speed's uncle (He was built by Ultron, the same being who built their father, Vision)
Ultron is Wiccan and Speed's grandfather (He built their father, Vision)
Jim Hammond is Wiccan and Speed's grandfather (His body was used to build their father, Vision)
Hank Pym is Wiccan and Speed's great grandfather. (He built their grandfather, Ultron)
Professor Horton is Wiccan and Speed's great grandfather. (He built Jim Hammond who is kind of like their grandfather since their father was built from his body)
Crystal is Luna's mother
Ronan is Luna's step-father
Medusa is Luna's aunt
Black Bolt is Luna's uncle in law
Ahura is Luna's cousin
Maximus is Luna's uncle in law
Gorgon is Luna's second cousin once removed
Karnak is Luna's second cousin once removed
Triton is Luna's second cousin once removed
Psynapse is Luna's second cousin once removed
Quelin is Luna's grandfather
Ambur is Luna's grandmother
Agon is Luna's great uncle
Rynda is Luna's great aunt
