Generally, all Ricks only had one child, Beth. But sometimes, every couple hundred universes, there was a blip. An anomaly. Twins.

Rick C-137 had just Beth. But now his wife and little girl were six feet under. Rick Prime hadn't even left enough remains for a cremation. Rick Prime was one of the few Ricks to have twins, not that he stuck around to raise them.

When Rick assimilated into Prime's universe, pretending to be him to stay with Beth Prime and her family, he hadn't expected to get so emotional. It wasn't fair that Rick Prime had perfectly good family left behind and he had nothing. He couldn't stand Beth's resentment of him, thinking he was the father that left.

He didn't leave. His Beth died.

But here Rick was, paying for the sins of another Rick.

And then there was you. You, who were so clearly Prime's kid. You had the brains and the cunning, following Rick and Morty on adventures. You did dimensional travel of your own for years until Rick came into your lives. Summer and Morty affectionately called you their 'crazy space aunt'.

But you were like Prime in other ways too. Quick to kill. Eccentric. You avoided emotional attachment like the plague in case there came a time where you needed to pack up and leave. Hell, for the first fourteen years of Morty's life he only saw you on Christmas and his birthday. You'd show up in a portal, give your niece and nephew some cool interdimensional trinket or a gadget you built, leave. If Rick hadn't started pretending to be Rick Prime you never would've decided to stay.

Rick loved you. You were still technically his daughter. But you were also Rick Prime's daughter.