In the following years, Mary battled to have the properties restored on behalf of her children, and on her ascension in 1558 Elizabeth restored the title of Baron Dacre to Mary's second son Gregory, her eldest son Thomas having died of the plague at age 15.
By her first husband, Mary Fiennes was the mother of:
1) Thomas Fiennes (1538–1553)
2) Gregory Fiennes, 10th Baron Dacre (1539–1594)
3) Margaret Fiennes, 11th Baroness Dacre (1540–1611). Margaret married Sheriff Samson Lennard of Knole and their daughter Elizabeth married Sir Francis Barnham, this connecting Mary to the Barnham family.
Mary Nevill married twice after her first husband's death and had several other children about whom little is known. Mary Nevill is the sitter in two significant portraits by Hans Eworth.