Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Edward III "ROBERT TIBETOT, TIBTOT, TIPETOT, TYBETOT, TYBTOFT, knight...He died on 13 April, 46 Edward III. His daughters Margaret, aged 6 years and more, Millicent, aged 4 years and more, and Elizabeth, aged 2 years and more, are his next heirs... A carucate of land, held of the lord le Roos... John Tybetot, knight, father of Robert, granted the premises for 14 years to William Dencourt, late lord of GranebyBy a fine levied in the king’s court with the king’s licence in the octave of Trinity, 22 Edward III, and granted and recorded in a month from Michaelmas in the same year, between John Tybetott and Elizabeth his wife, querents, and John de Sandale, parson of the church of Arkesay, and John de Kyneton, parson of the church of Radclif, deforciants, touching the manors of Bentelay and Haunthwayte and the advowson of the church of Arkessay, the said John Tybetot acknowledged the manors and advowson to be the right of the deforciants, who thereupon granted them to him and Elizabeth his wife for life, with remainder to Robert his son and the heirs of the body of the said Robert by Margaret daughter of William Deyncourt, and with remainder over to his right heirs... held jointly with Margaret his wife, who survives". External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol13/pp178-195. Reference: C 135/230/3 (Data from direct source)
2) Source: Chancery: Inquisitions Post Mortem, Series I, Edward III "JOHN TIBETOT, TYBETOT, or DE TIBETOT, KNIGHT...He died on 13 April last. Robert, son of the said John and Margaret, aged 26 years and more, is their heir... He held the premises for life by the courtesy of England for that they belonged to Margaret daughter of Bartholomew de Badlesmere late his wife, mother of the undermentioned Robert, who is her heir...gift of John de Sandale, parson of the church of Arkesay, and John de Kyneton, parson of the church of Radclif, by a fine levied in the king’s court in the octave of Trinity, 22 Edward III, with remainder to Robert Tibtot and his issue by Margaret daughter of William Deyncourt," Date: 1367. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol12/pp144-155. Reference: C 135/196/8 (Data from direct source)
3) Source: Waller of Woodcote "Marriage settlement of Robert, son of John, and Margaret, daughter of William, made by Sir John Tibetitt of Langar and Sir William Deiyncourt of Graneby [Granby, Notts.]: arrangement to enfeoff couple, and their heirs with £100 worth of land. Provision made for Margaret if she is widowed, and for John, son of John Tibetot." Date: 14 Jan 1347/8. External Link
https://discovery.nationalarchives.gov.uk/details/r/ebd3fb9a-337d-4800-89fe-f4ecff1a5360. Reference: CR 26/1/11/K3 (Data from direct source)