How confident are you that Thomas's middle name was Wellington?
His son and grandson Oscar (and Oscar's son Oscar) as well as his sister's son (Mary Hittle married McClure Drake and had a son named Oscar) all had the middle name Wellington. That may make Thomas's middle name then suggest that Wellington may have been the maiden name of Thomas's mother, who was the wife of Michael Hittle, son of David and Hannah (Jones) Hittle.
Or possibly Wellington may have been Mary's father's given name, as that sometimes appears.
I'm still looking both for Thomas's mother Mary's maiden name, as well as the maiden name of his wife, Lydia, who later remarried to Robert Beers after Thomas's death in 1899.
Do you also happen to know where Thomas was buried?He appears in the church records of Canby Lutheran up until he and Lydia were married.His two brothers, Sylvester Wesley and George Washington are buried there, as well as his sister, Mary (Hittle) Drake.If Thomas is there, the grave apparently was never marked.
Here's hoping you find this this much later than you originally posted!