William Grandison, 1st Lord Grandison
William is no longer alive.

 Katherine de Grandison
Katherine was born in 1304 in Ashford, Hertfordshire, England.  She died at the age of 45 on November 23rd, 1349 in Bisham, Berkshire, England.

 John Grandison
John was born in 1307.  John is no longer alive.