Question

who is this Frank Gill? Brother to Jack & Tom Gill? Married to Lillian Gill?

Comments

Anonymous, we're going to need a bit  more information than this to be able to help you. Looks like you forgot to add a link to the profile page in question. We need the  time period (or better, specific dates if you have them), and location, and any information you already have that suggests support for this family structure.

Answer 1

There was a Jack Gill born 1913, son of Phelps Gill. Jack Gill's mother was named Lillian. She died shortly after Jack was born. Some time later, Phelps Gill remarried and  had three sons with his second wife. The third son was named Tom.

So, Tom Gill was a half brother to Jack Gill, Jack Gill's mother's married name was Lillian Gill. Both brothers had a great grandfather named Frank Gill.