Ethan Allen's father was Joseph Allen. It is Samuel-1, Nehemiah-2, Samuel-3, Joseph-4 and then Ethan-5 b. 1/10/1737-38 born in Litchfield, Connecticut. His siblings were: Heman b. 10/15/1740, Lydia b. 4/6/1742, Heber b. 4/4/1743, Levi b. 1/16/1745, Lucy b. 4/2/1747, Zimri b. 12/10/1748, Ira b. 4/21/1748 all born in Cornwall, Connecticut. There is no mention of a Thomas. Unless there is a missing sibling, I am sorry to say there is no Thomas...gulp...break it to them gently. If I can be of further help please feel free to contact me.