Okay, so we have NO info on Mystery Twins parents, correct? So, I made my own headcanons for them!
-Okay, their MOM is super sweet and supportive and kind and caring, however their DAD sucks
-Just generally as a person.
-Their mom's name is Melissa, and their dad's name is Sean.
-Melissa is the one related to Stan and Ford
-She somehow convinced her ex-husband to take her last name
-J.K it was decided on a coin-flip.
-Their mom has decided to remain unmarried, but their dad has a new wife and two stepkids
-The wife, Jenny, and her kids, Maddie(f9) and Laura(f12), are actually really awesome.
-Mom makes pancakes every Sunday morning without fail
-And she always listened to Dua Lipa while doing so.
-They live with Mom full-time, and see dad maybe once bi-monthly
-They see Jenny and her kids a lot more often though.
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Gravity Falls Schist That Lives Rent-Free In My Head
FanfictionTitle is quite descriptive.