Joel Walker - Sorting out the Children of Joel Walker and Sarah Parish Walker (Moseley)

Joel Walker married [Sarah Walker Parrish Sarah Parrish] circa 1723 in New Kent, Virginia, USA. Together they had the following children:
# [Elizabeth Shirley Elizabeth Shirley]; born 1725 died 1798 needs merged

# [Asaph Walker Asaph Walker]; born 1729 died 1808

# [Mary Walker Mary Walker]; born 1731 died 1800

# [Joel Walker, Jr. Joel Walker]; born 1733 died 1799 ***

# [William Walker William Walker]; born 1737

# [Elizabeth Jones Elizabeth Jones]; born 1725 died 180 - needs merged with #1

# [Mary Walker Mary Walker]. ***Born 1754 __ father died 1746 This Mary Walker, born 1754 doesn't belong on this generation - she perhaps was Joel Walker Jr's daughter?

Joel Walker, Sr. died in 1746 in Henrico, Virginia, United States.

I need my Walker Cousins to assist. Joel Walker was my maternal 1st cousin 6 XR - his wife is my Mosley paternal 6th Great Aunt.
What I find interesting is Joel Walker, Jr migrated to Georgia as did my maternal Lancaster / Walker great-grandparents

We need to find where our 2nd Mary Walker fits in our lineage- her son is kin to us, Dr. Joel Walker - his ancestors match DNA.

We just need to try to document and figure this out together. I'm really busy at the moment, so if a few people could get together it would be wonderful.