In 1626 his son John erected a monument to his grandfather in Brympton church, hence confirming his parentage - but even this needs some clarification - with all the Johns.
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Met andere ega's vermeld bij Stirnet.( E:\E-S009\genealogy\Grab_A_Site_downloads\stirnet\sydenham2.htm )
c. Mary Poyntz (bur 07.10.1591) m1. Francis Codrington of Frampton-on-Severn (d before 28.10.1581) m2. John Sydenham of Nimpsfield (d before 05.01.1590/1)