This is the other step daughter of William Thomas.
1939-1 Penrice Street, Swansea, Swansea C.B., Glamorganshire, Wales
THOMAS, MARGARET ANN EVANS her dob 5th August 1889 see occupation in 1939
GRO Reference: 1889 S Quarter in SWANSEA Volume 11A Page 765
SS
added, probate record for Anna Thomas 1940 names both daughters, Margaret Ann & Mary Ethel.
Probate record of William Thomas of 1, Prenrice Street, Morriston, died 1st December 1926. To Anna Thomas £246,3s 6p
THOMAS, WILLIAM aged 68
GRO Reference: 1926 D Quarter in SWANSEA Volume 11A Page 960