Isaac Tewksbury - Sorting Out Three Different People Named Isaac Tewksbury

It appears that three different Isaac Tewksburys are getting mixed together in Geni. Here is the most carefully documented info I can find so far:

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Isaac TEWKSBURY was born on 17 AUG 1698 in Amesbury, Essex County, Massachusetts. (SOURCE: Early Vital Records of Essex County, Massachusetts to 1850 for Amesbury.) He died on 17 NOV 1765 at Amesbury, Essex County, Massachusetts. (BOOK SOURCE: "The Colby Family in Early America" by Frederick Lewis Weis, Caledonia, The Colonial Press, pub 1970.)

Parents: Deacon John TEWKSBURY and Hannah COLBY.

Spouse: Sarah SARGENT. Isaac TEWKSBURY and Sarah SARGENT were married on 11 JAN 1720/21 in Amesbury, Essex County, Massachusetts.

Children were: Elizabeth TEWKSBURY, Jacob TEWKSBURY, Thomas TEWKSBURY, Sarah TEWKSBURY, Sarah TEWKSBURY, Dorothy TEWKSBURY, Alice TEWKSBURY.

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Isaac TEWKSBURY was born on 28 APR 1737 in Amesbury, Essex County, Massachusetts. (SOURCE: Early Vital Records of Essex County, Massachusetts to 1850 for Amesbury.)

Parents: David TEWKSBURY and Anne WORTHEN.

Spouses and children are unknown.

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Isaac TEWKSBURY was born on 17 AUG 1747 in Amesbury, Essex County, Massachusetts. He died in MAR 1813 at Brooklyn, Susquehanna County, Pennsylvania.

Parents: Jacob TEWKSBURY and Sarah BAGLEY.

Spouse: Judith SARGENT. Isaac TEWKSBURY and Judith SARGENT were married on 23 JAN 1766 in Amesbury, Essex County, Massachusetts.

Children are unknown.

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The first Isaac reference above is the only one that lists children, including Jacob and Thomas. But the Geni profile of an Isaac Tewksbury who had children by those names seems to more closely match parents and date of birth for the second Isaac, and the spouse of the third Isaac referenced above.
Isaac Tewksbury

Can anyone produce any further documented evidence to help sort this mess out? If not, I will plan to use what I have to fix it using the above as an outline.