The Byzantinist Donald Nicol, who researched the family's history, categorically identifies him as the brother of George Palaiologos Kantakouzenos; Giovanni Musachi makes him the brother of Irene Kantakouzene, wife of Serbian Despot Đurađ Branković, but incorrectly states Thomas was the son of the Emperor John VI Kantakouzenos, an error DuCange repeats.
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