Question: I understand that a genealogy on the Lilly family was attributed to the genealogist Gustav Anjou. Is it true he was a genealogist who would fabricate genealogical lineages?
Answer: It is a sad story but very true on what you have heard about Gustav Anjou (1863-1942). He would compile fascinating fabricated genealogies for his clients. Robert Charles Anderson identifies a listing of genealogies that can be attributed to Anjou. Lilly is among those listed in Anderson's article - "We Wuz Robbed, The 'modus operandi' of Gustave Anjou" published in the Utah Genealogical Society's - Genealogical Journal (1991) 19:47-58. The full title of the Lilly volume you mention is The Lilly Family: Lillie, Lille, Lilli, and Lily Families from Sweden to France to America, 1291-1898.