In this article, the author proposes (110:90, 110:165) that the John Jenks who married Sarah Fulwater in London in 1595/6 was the father, by an earlier marriage, of John Jenks of the Precinct of the Tower of London and Jonas Jenks, both of whom became freemen in London on the same day in 1604 (110:86). He further suggests that John Jenks, the father, was the son of William Jenks, brother of Richard Jenks of Clun, Shropshire, whose 1623 will mentions the sons of his "cousin" Jonas Jenks.
See the citation from NEGHR 122:168-70 in which the author changes his mind about the John Jenks father/son hypothesis - leaving Jonas to be, presumably, the son of William Jenks.
'Jonas Jenks, ... of Bermondsey, Surrey, and St. Alphage, London Wall, Cripplegate, London, chandler, was born about 1580. He was in London in 1596 when he was apprenticed ...'
'He was buried [in St. Alphage, London Wall, Cripplegate, London] 24 April 1622 ...'