There were two Benjamin Merricks in Eastham, on Cape Cod in the 1660s and 1670s. Both descend from PGM ancestor William Merrick. Which one lived to adulthood? They were an uncle and nephew, and both had fathers named William Merrick. In order to keep them straight let's use their mothers as their identifying distinction.
*The uncle is Benjamin Merrick-52, born in 1664 in Eastham, the son of Rebecca Tracy.
*The nephew is Benjamin Merrick-2449, born in 1674 in Eastham, the son of Abigail Hopkins.
There are two authoratative publications that say that Benjamin Merrick married first Rebecca Doane, and second, Rachel Holmes. The evidence is clear that only one of the Benjamin Merricks was the husband of both of these women. But which one?
The connundrum is that Mary Walton Ferris, ''Dawes-Gates Ancestral Lines,'' 2 vols. (n.p., 1931), p. 585 says he was the son of Rebecca Tracy, while ''Mayflower Families Through Five Generations, Vol. 6, Stephen Hopkins'' (the Mayflower "silver book") states that he was the son of Abigail Hopkins.
It appears to me that the son of Abigail Hopkins is correct based on three documents:
* A deed dated on 3 February 1741/2 where Benjamin Merrick, along with his brother Nathaniel and sister Ruth, conveyed land to Jonathan and Joseph Sparrow, as intended by "William Mirrick late of Harwich" deceased (the husband of Abigail Hopkins). Note the date is 1742. A partial transcription can be found here: Bowman, George Ernest, "Unrecorded Barnstable County Deeds - Myrick and Foster to Sparrow" ''Mayflower Descendant'' Vol. 15:203.
*The will of William of Harwich (married Abigail Hopkins) who died in 1732 can be found here in Barnstable County Probate Records Vol. 5:33
*The will of William of Eastham (married Rebecca Tracy) died much earlier in 1689, can be found here in Barnstable County Probate Records, Vol. 1:22
With the deed stating indirectly the relationship between Benjamin as being the son of William of Harwich, husband of Abigail, and the will of the same William of Harwich, I feel the conclusion is reached that these are the proven father & son.
[NOTE: The profiles for the two Benjamins currently are connected in the reverse of what I'm presenting here.]