The following are notes in the search for William and Mary, father and mother of Henry and Robert Jennings (Twins) and Issac Jennings.
Process – Search all William and Mary Jennings in London, Middlesex, and Surrey with marriages between 1630 and 1641 in FamilySearch.org Reviewed results of 1224 names which were reduced to 94 names associated with London, Stepney, and Surrey.
Conducted a second search for William and Margery Jennings to account for John Jennings. The search yielded a Margaret Jennings of St Giles without Cripplegate and a Margery Jennings
No direct results determined the parents of Henry, Robert, and Issac.
Today determined that William and Margery Jennings are not the same as William and Mary of St Clements of the Dane. William Jenninges Tayler became sick and died in 1654 on the ship Smyrna Merchant returning from India to England. William Jenninges will mentions his wife Margery. This is the likely father of John Jennings.
Also, reviewed the will of William Jennings the Haberdasher of St. Giles. The will is dated the 11th day of November 1686. I will investigate each person mentioned in the will including the many cousins, his brother John, son John and so forth. These Jennings with their many cousins may lead to further discoveries.
Reviewing probate and tax records for Middlesex with a cluster of records around St. Clements, St Martins, and St Margarets.