I also descend from Abigail Munson & Westbrook Knight, specifically via their daughter Hannah Knight. Sorry, I can't give you insight re Abigail's siblings...I just thought I could compare notes with you concerning the Littlefield heritage. I, too, have found others' research on this line which said that Francis Littlefield was son of Annis Pope & Francis Littlefield (b. 15 APR 1530) who was son of William Littlefield (b. ABT 1500). I didn't capture the links of my sources when I researched it several years ago.