Edgeworth has no biological siblings

He does, however, have two adoptive sisters courtesy of von Karma

There's Franziska, who actually showed up in canon, and Franziska's older sister, who only gets a brief mention

In my heart of hearts, Franziska and Edgeworth occasionally team up to torment her.

IT'S CHRISTMAS/HER KID'S BIRTHDAY/ANY OTHER EXCUSE TO BUY GIFTS?

LETS BUY OUR SISTER'S KID SOMETHING LOUD AND OBNOXIOUS

though, before von Karma

I imagine that Phoenix's family kinda-sorta absorbed Miles into their family

as people are sometimes wont to do with children who have busy parents

not that Greg was neglectful or anything, but. Single dad and professional lawyer. That doesn't give him a lot of free time