This Is Us Stars Recall the Family Members We Never Met (Beth Had a Sister?!) — Watch Video

That set off a cascade of memories about forgotten This Is Us siblings, with Moore chiming in: “You never meet Rebecca’s sister, either.

The big happy family on This Is Us could’ve been even bigger, it turns out.

In fact, Beth had three (!) siblings we never met on the show: sisters Lisa and Renée, and brother Isaiah.