Chris Given-Wilson, in his ODNB article of 3 Jan 2008 at https://doi.org/10.1093/ref:odnb/9529, says:
"He was survived by, probably, six children: Richard (II) Fitzalan, who succeeded to the earldom following Mortimer's downfall in 1330; Edmund and Michael, who both entered the church; Alice, who married John de Bohun, heir to the earldom of Hereford, in 1325; Aleyne, who married Roger Lestrange of Knockin (c.1338); and Jane, who is said to have married Lord Lisle."
Personally, I'd be confident there was both an Alice and an Aline. However WikiTree, true to its early traditions, has managed to award him lots of other children.