Aunt Clara's relationship to Samantha
I know it's never been revealed how Aunt Clara is related to Samantha on the show.....
But I like to think that she is Maurice's older sister.
1. Endora and Arthur never talk about her as a sibling.
2. Endora certainly has never shown any warmth to her
3. Maurice on the other hand ALWAYS is super nice and even loving towards her. Pus she has somewhat of British accent as does Maurice (Endora sort of does but hers is more of a pseudo posh/glamorous Continental accent.
It would also make sense if Clara were Maurice's aunt, making her Samantha's GREAT Aunt, but somewhere I read a quote where Clara says she'll be a "great" aunt when Tabitha is born.
So I like to think she and Maurice are brother and sister.