Dates I have (from the book)for children of Henry Dow and his cousin Rebecca Dow are: Polly b. 8 Sep 1788 Elisha b. 25 Feb 1790 Asa b. 27 Jan 1792 Henry b. 13 May 1794 Benjamin b. 16 Feb 1797 John b. 15 Apr 1799 Nathan b. 24 Jun 1801 Asa b. 8 May 1803 Rebecca b. 19 Aug 1805.
I have for John Dow that his will was dated 1 July 1544. The will of his widow Johan was dated 22 Aug 1549. Sole Legatees of her will were Thomas, Christopher and Katherine. Thomas was 16 when his father died. I don't know when John died, but do know Johan was a widow in 1549. Thomas's son Henry's birth is listed as 1550. I don't know the basis for that date. Henry m. Elizabeth March 12 May 1594. His son Henry (immigrant ancestor) was baptized 6 Oct 1605. I don't have his actual birth date.