Sir John Jennings - Sir John Jennings of Sandridge

The profile you mentioned is not the same John Jennings that was elected to parliament . The one you are looking for is

Sir John Jennings

BIRTH: 08 Apr 1579 (8 Apr 1579) - England
DEATH: Aug 1642 - England
PARENTS: William Jennings, Joan Elliot
SPOUSE: Joyce Weaman

Please see:
http://books.google.co.uk/books?id=cnwiNctJrGgC&pg=PA450&dq...

It describes Richard Jennings, father of Sarah 1st Duchess of Marlborough, succeeding his father Sir John Jennings of Sandridge as MP. It also mentions Richard's mother as Alice Spencer.

Just to be entirely clear. The records, not inconsequential ones as they are records of elections and members of the English parliament, show that the John Jennings who died in North America in 1635, could not possibly be the same man as Sir John Jennings of Sandridge, who was elected to parliament in 1640.

Sir John Jennings was the husand of Alice Spencer daughter of Sir Richard Spencer of Offley and was the grandfather of Sarah Jennings wife of John Churchill 1st Duke of Marlborough.