Parents and Relatives of the Fabulous 4

Sean
Sean has a Mother and Father and a well known Grandfather (Old Man Mgs). Sean's Parents went into hiding for an Unknown reason. It is Unknown if Old Man Mgs ever went into hiding, but if he did he has come out of it (as seen in Episode 2). Sean's Family is known for the inheritance of Pancake Ninjas.

Old Man Mgs
Old man Mgs is Sean's Grandfather, imprisoned during war. This caused him to go insane.

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Trevor
Trevor had a Mother and a Father and a possible extended Family. According to FF Episode 2 Trevor's Parents are both dead killed by the "Hooligans"

Trevor also has a named Grandfather Denis.

Trevor's Family has a tradition where you must wear an Animal on your head.

His Family is also very big into science.

Trevor's Dad was most likely an Alchemist.

Emarie
Emarie had a Mother and a Father. Emarie's Mother is a Cat ( Possibly Half Cat) and her Father is most likely a Human. It is most Likely that her Parents made her while in hiding (as Emarie said that she was "Born in it").

According to FF Episode 2 Emarie's Parents where both killed by Warlocks and necromancers.

Cora
Cora has a Mother and a Father. They are also a possible antagonist of the Fabulous Four, considering that they locked her up and rarely allowed her to go out. And when Cora Escaped, Cora knew that they would go looking for her.

Cora's parents are most likely Scientist considering that they did experiments on Cora.