Mabel was the daughter of unknown parents. The date and place of her birth have not been found.
Her husband was Ralph le Soor, who she married in ABT 1271. The place has not been found. Their only known child was Joan (?-?).
| Association | Relationship |
|---|---|
| sir Maurice de Berkeley | father? |
| Margery de Vere | mother? |
Note 1
I have seen her parents given as Maurice B (d 1346/7) and Margery B, and as Maurice B and Isabel Fitzroy, but neither of these would make her the sister and co heir of a Maurice, as far as I can see.