--Thanks for your help. Your hints sound almost exactly like what I've "calculated" on ancestry.com, except for Ann Tendall. I came across that possibility, also an Ann Tickner, but neither seemed to fit or "feel" like a match, mainly because of geographic distance, if I remember right. So I'm still doubtful about Thomas' mother.
--For Thomas' father, JOHN, I had completely guessed at the year 1765 -- which oddly you also listed(?) -- but I have nothing to back that up with, no date, no place, just a guess-timate.
--I also found Amelia Palmer, baptized 1805 at St. Pancras, Middlesex -- but in later census records she listed her birthplace as Limehouse, which is 5.3 miles from St. Pancras, hence I was skeptical, and those censuses point to DOB in 1800, but maybe she wasn't baptized till years later??
--I had also completely guessed that Amelia and Thomas were wed in 1826, but have no proof of when or where... just a guess.
So, I truly appreciate your answers, but they seem to leave me with basically the same questions.