Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Edward I "Robert de Ufford... Robert his son, aged 19 at the feast of St. Barnabas last, is his next heir." Dated: 1298. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol3/pp360-364. Reference: C 133/84/5 (Data from direct source)
2) Source: Ancient funerall monuments within the vnited monarchie of Great Britaine, Ireland, and the islands adiacent "Sir Raufe Ufford, and Dame Jone his wife... Dame Jone Weyland, Sister of the Earl of Suffolk; John Weyland, and Jone his wife". Reference: Page 720; "Burials in the black Friers at Dunwich" (Questionable reliability of evidence)
3) Source: Chancery: Inquisitions Post Mortem, Series I, Edward II "Robert de Ufford...Robert his son, aged 18 on the eve of St. Lawrence last, is his next heir." Dated: 1316. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol6/pp44-62. Reference: C 134/56/5 (Data from direct source)