NO they never find out about Tabithas magic.
Phyllis Stephens who was portrayed by actress Mabel Albertson.
There were many characters who in Bewitched. The main character was Samantha Stevens Married to Darrin Stevens. Then there was Samanthas mother Endora. Darrin had a boss Larry Tate and his wife Louise Tate. Then there was Aunt Clara Samantha's aunt and there 2 children Tabitha and Adam Stevens. Those were the regular characters with the exception of Adam.
The cast of The Streets of London - 1934 includes: Phyllis Baker Campbell Copelin Guy Hastings Ethel Newman as Mrs. Fairweather Leonard Stephens as Paul Fairweather
Phyllis Kirk's birth name is Phyllis Kirkegaard.
Phyllis Fox's birth name is Phyllis Piper.
Phyllis Crane's birth name is Francis, Phyllis.
Phyllis Curtin's birth name is Phyllis Smith.
Phyllis Brooks's birth name is Steiller, Phyllis.
Phyllis Sues's birth name is Phyllis Gehrig.
Phyllis Naidoo's birth name is Phyllis David.
Phyllis Gottung's birth name is Phyllis Lonergan.
Phyllis Haver's birth name is Phyllis O'Haver.