| Well, thank you for inviting me!
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Morgan and her twin brother Spencer was born in Mexico City. Her father had just gotten killed at the time of her birth. Her mother had been left greaving for the rest of her life, until she met Jameson Arch on vacation in Argentina. They soon got married and moved to Danville to life near Yasmyn's brother - Dr. Heinz Doofenshmirtz.
Soon after moving into the purple house 3 doors away from the Flynn-Fletchers, she meets Phineas and Ferb. Before they introduced themselves, Morgan called Phineas Mr. Triangle and she called Ferb grass head.
After some troubled events at D.E.I, Morgan and her family move to Rio.
Yasmyn McDonald Arch - Mom
Jameson Arch - Stepdad
Robert Arch - Stepbrother
Spencer McDonald - Brother
Dr. Doofenshmirtz - Uncle
Jason Kuthburt - Husband
Jonas - son
Mason - son
Jordyn - daughter
Lexy - daughter
Phineas and Morgan dated through the summer until an accident at D.E.I. Once she returned to Rio though, she helped Phineas realize Isabella's love for him.
Jason is Morgan's future husband she met on a plane trip to Rio.
Morgan has reddish brown hair and brown eyes. She wears a outfit like Candace but it is a blue-green colour.