That’s not to say Beth and Randall are sympathetic towards Deja’s mom one bit, but they do care for Deja, who in turn cares for her mom.
Given that, and the fact that it wouldn’t be the first time Randall took a stranger into his home on This Is Us, its possible Deja’s mom is coming to live with the Pearsons as well.
After all, if Beth and Randall really wanted Deja’s mom out of the picture they could’ve called child services when Deja first arrived weeks prior asking for money to pay her mom’s gas bill so she wouldn’t be removed from the home again.
One thing that seems certain is that Deja might not be the only person coming to live with Beth and Randall, as the two aren’t just going to let Deja’s mother suffer on the streets while they take in her daughter.