She could not have been married to *both* Anchitel de Grey and John de Grey of Rothersfield. John's wife is unknown (someone took a nasty slam at Robert Glover, Somerset Herald as creating "fantasies" to identify her), so I disconnected him.
Cawley's MedLands recognizes only five children of Baldwin de Redvers (1st Earl of Devon) and wife Adeliza:
1. Richard (heir and successor, 2nd Earl of Devon);
2. Hawise, who married Robert FitzRobert (also called Robert Castellan);
3. Henry (died young);
4. William "de Vernon" de Redvers, 5th Earl of Devon (succeeded after two nephews died heirless);
5. Adelisa, who married Roger de Nonant.
Wikipedia cites *eight* children:
1. Richard de Redvers, 2nd Earl of Devon. Married Denise de Dunstanville.
2. Henry de Redvers
3. William de Redvers, 5th Earl of Devon. Married Mabel de Beaumont.
4. Matilda de Redvers, married to Anschetil de Greye.
5. Maud de Redvers, married Ralph de Avenel. (This is suspicious, as "Matilda" and Maud" were synonymous.)
6. Alice de Redvers, married Roger II de Nonant.
7. Hawise de Redvers, married Robert Castellan.
8. Eva de Redvers, married Robert d' Oyly.
References
Frederick Lewis Weis Ancestral Roots of Certain American Colonists Who Came to America Before 1700; Line 50-27
Cokayne, George Edward (1916). The Complete Peerage, edited by H.A. Doubleday. IV. London: St. Catherine Press.
Charles Mosley, editor-in-chief Burke's Peerage and Baronetage, 106th edition, 1999, Page: 832
Robert Bearman, ‘Revières , Baldwin de, earl of Devon (c.1095–1155)’, Oxford Dictionary of National Biography, Oxford University Press, 2004.[1]
"Baldwin of Redvers". Dictionary of National Biography. London: Smith, Elder & Co. 1885–1900.
Weis would have to be the source for the full list of children (if there was any one source, and not sundry contributions), as the others cite main descent only.