Cokayne: Richard "m., possibly as 2nd wife, Alice, whose parentage is not known ... His widow married Alexander de Piro. ... William and his brother Richard [sons] appear to have been children at their father's death. This, combined with the way in which they are referred to by their mother, suggests they were probably the issue of a later marriage."

This wording is confusing, as to who Richard or alice outlived the other. For Richard to have two children by a later marriage, implies he outlived his wife. For Alice to be a widow who remarried, implies that she outlived her husband.