Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Edward I "Walter Heron...Silkeston. The manor held by the said Walter and Alice his wife...Walter son of William Heron had no lands or tenements in the county; he had a daughter named Emelina, now aged 7 1/2, who is his next heir in blood; she is likewise next heir of William father of the said Walter, who held the manor of Haddeston of the king in chief, and died at Newcastle upon Tyne on Sunday before the feast of St. Thomas last. The said Walter died long before the said William. Mary late the wife of the said William is dowered by the king’s command of a third part of the aforesaid manor. Neither of the said Walter or William his father has any other heir than the same Emelina whilst she lives: her marriage, as the jury believe, is worth 30l. to sell."Dated: 1296. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol3/pp255-265. Reference: C 133/78/19 (Data from direct source)
2) Source: Chancery: Inquisitions Post Mortem, Series I, Edward I "William Heyrun, alias Heyron...Emelina, daughter of Walter Heyron, aged 6, is his next heir, and it is believed that she is with Lady Emelina de Hastings in Norfolk at her manor called Gissing."Dated: Dec 1297. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol3/pp255-265. Reference: C 133/78/18 (Data from direct source)