All the best US sitcoms get spin-offs and The Big Bang Theory is no different. Unlike Joey and The Cleveland Show, Young Sheldon is actually good. One thing you might not have noticed in the sibling shows is how well Young Sheldon did in casting a young version of Laurie Metcalf’s Mary Cooper.

In Young Sheldon, Sheldon’s mom is played by Zoe Perry, an actress remarkably similar to Metcalf. As it turns out, this isn’t actually a coincidence, with Perry being Metcalf’s real-life daughter.

Big Bang isn’t even the first time mother and daughter have played the same character at different ages. Perry’s very first acting role was as Metcalf junior in Roseanne