In 1561 [his grandmother] Joan Bourchier 3rd Baroness Berners died. Her grandson Thomas Knyvet 4th Baron Berners (age 22) de jure 4th Baron Berners. He failed to formally claim the title Baron Berners until 1616, when the office of the Earl Marshall certified his "right and title to the Barony of Berners", but he died shortly thereafter, before the new king James I could confirm the title.

On 17 Feb 1561 [his father] John Knyvet (age 51) died.

On 17 Jul 1600 [his sister-in-law] Elizabeth Fortescue (age 70) died.

In 1605 [his daughter] Mary Knyvet (age 26) died.

In 1605 [his son] Thomas Knyvet of Ashwellthorpe in Norfolk (age 45) died.

On 23 Dec 1607 [his brother-in-law] John Fortescue (age 76) died to John Fortescue (age 76).

After 1611 [his brother-in-law] Anthony Fortescue (age 76) died.

Before 09 Feb 1616 Thomas Knyvet 4th Baron Berners (age 77) died. He was buried on 09 Feb 1616. His grandson Thomas Knyvet 5th Baron Berners (age 19) de jure 5th Baron Berners. He would maintain his claim to the Barony for several years, but never succeed in obtaining it.

On 25 Apr 1616 [his former wife] Muriel Parry (age 68) died.