These are two very different people. The name is spelled Francis Lucille (two l's), and I've answered for him.
Tony Parsons is a British journalist and novelist, born in 1953 in Essex. He started as a punk journalist at the New Musical Express in 1976 and later wrote novels about thirty-something men, starting with Man and Boy (1999). That book won the British Book Awards' Book of the Year and has sold millions of copies. Its sequels are Man and Wife and Men From the Boys.
Francis Lucille is a French-born spiritual teacher in the Advaita Vedanta tradition, which teaches nonduality, the idea that there is only one reality. He trained at the École Polytechnique in mathematics and physics, then became a disciple of the teacher Jean Klein in 1975. He has taught satsangs and retreats since 1981 and is known for dialogues and books such as Eternity Now and The Perfume of Silence. You can read more on his teacher page at the Omega Institute.
In short, Parsons writes fiction about family and modern life, and Lucille teaches a philosophical and spiritual path. Their work is not comparable on the same terms.