Their son Robert's profile includes Joan in a "Disputed Children" section: Joane...
Full citation
Their son Robert's profile includes Joan in a "Disputed Children" section: Joane Holland (c1305-1340). She was a sister of Robert & married John Radcliffe. The section's introduction notes that "theyhave been disconnected as children" (no verifiable sources have been found), and that Lewis "slips in two extra unsourced daughters, Mary and thrice-wed Joan." (the attribution statement is "a note that had been included with the Lewis source below Lewis says..." (the attribution statement is "a note that had been included with the Lewis source below Lewis says..."- perhaps the statement just meant to say that a note had been included with the citation). MedLands is cited, but that citation is for the following statement, that "Mary is included in MedLands, but not Richardson." Holand A: Origins (starts with Henry de Holland, grandfather of Thurston de Holand, who died 1275, father of Robert married Samlesbury). Holand B: Lords Holand (starts with Robert & Elizabeth's son Robert married Zouch, "created Lord Holand 29 Jul 1314").