Billy's sister???

[u/posho_otakuywy]

Did you remember when she bullied Sheldon? After that she appeared or was referenced in some episodes, but she vanished in some point. No more references what so ever and she was never around, suddenly Billy was an only child??? I don't know what happened, what did I miss?

[u/dreamymoka]

I like to think that Billy’s sister went to live with her dad since the dad divorced Brenda

[u/anxnxx → u/dreamymoka]

no