Sources

1) Source: Duchy of Lancaster: Deeds, Series L "Eleanor of Provence Queen of Henry III"Dated: 24 February 1284. External Link
http://discovery.nationalarchives.gov.uk/details/r/C16100539. Reference: DL 25/2342/2032 (Data from secondary evidence)
2) Source: Duchy of Lancaster: Deeds, Series L "Eleanor the Queen-Mother to Edmund her son". Dated: 1284. External Link
https://discovery.nationalarchives.gov.uk/details/r/C5687428. Reference: DL 25/2342 (Data from direct source)
3) Source: Quondam Monachi S.Albani Chronica et Annales "He married a noble lady, named Eleanor, the daughter of the count of Savoy, by whom he had two sons, Edward, who became king after him, and Edmund, who was earl of Leicester and Lancaster; and two daughters, namely, Beatrice, who was married to the count of Brittany, and Margaret, who became the wife of the king of Scotland.". Reference: 1272 (Data from direct source)
4) Source: Exchequer: Treasury of Receipt: Diplomatic Documents "Draft agreement between Philip, King of France, and Joan, Queen of Navarre, his wife, on the one part, and Edmund, son of Henry III., and Blanche, Queen Dowager of Navarre, his wife, on the other part, as to their respective rights in Champagne." Dated c1285. Evidences fathership of Edmund Lancaster. Reference: E 30/1525 (Data from direct source)
5) Source: Exchequer: Treasury of Receipt: Diplomatic Documents "Charter of Alfonso X, King of Castile, ceding to Edward, eldest son of Henry III., whom he has knighted, all his rights in Gascony."Dated: 1254 Evidences father of Edward I. External Link
http://discovery.nationalarchives.gov.uk/details/r/C3624444. Reference: E 30/1108 (Data from direct source)
6) Source: The chronicle of Florence of Worcester with the two continuations "1290: Gilbert de Clare, earl of Gloucester, married at Westminster, on the last day of the month of April, the lady Joan, surnamed of Acre, from her having been born there, the daughter of the King of England." Evidences Edward being father of Joan of Acre.. Reference: 379 (Questionable reliability of evidence)
7) Source: Chancery: Inquisitions Post Mortem, Series I, Henry IV "Thomas Moubray (Mowbray), earl Marshal...John Moubray, his brother and heir...He held the manors of Bosham and Stoughton in fee tail by the grant of Edward II to Thomas de Brotherton, his brother, of the lands of Roger le Bygod, sometime earl of Norfolk and Marshal [CChR 1300–26, pp.205–6]. They descended to Margaret duchess of Norfolk as daughter and heir of Thomas, from her to Thomas de Moubray, duke of Norfolk, as son of Elizabeth, daughter of Margaret, and so to Thomas as son of Thomas Moubray, and now to John Moubray as brother and heir...to William de Brewosa, senior, with remainder to John de Moubray and Aline his wife and their heirs. From them they descended to John their son, John his son, to Thomas duke of Norfolk, his son and heir, to Thomas the Earl Marshal, and now to John his brother...7 messuages and 10 bovates in Epworth, Haxey, and Owston in the Isle of Axholme, which John Lord Moubray, son of John, son of Roger"Dated: 1407 Evidences Edward I is father of Thomas of Brotherton.. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol19/pp101-120. Reference: C 137/62/76 (Data from direct source)
8) Source: Chancery: Inquisitions Post Mortem, Series I, Edward I "Joan, late wife of Gilbert de Clare, sometime earl of Gloucester and Hertford, the king's daughter...Gilbert de Clare, aged 17 on 11 May last, is next heir of the said earl and Joan...She died 19 April, 35 Edw. I...wherein the said Joan was not conjoined, for Alice de la March, sometime the wife of the said Gilbert, held (it) by his demise...Maud de Clare, sometime countess of Gloucester, in her widowhood procured...the same descended to the heirs of the said Gilbert and Joan by the said Jordan’s death, as heirs of the said Maud"Dated: 1307 Evidences Edward I being father of Joan Acre.. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol4/pp311-331. Reference: C 133/128/1, C 133/129/1, C 133/130/1 (Data from direct source)
9) Source: Exchequer: Treasury of Receipt: Scottish Documents "...grant by Edward I. to Humphrey de Bohun, Earl of Hereford and Essex, and Elizabeth, his wife, the king's daughter, of the castle of Lochmaben and the lands of Robert de Brus in Annandale." Dated: 1306. Reference: E 39/4/13 (Data from direct source)
10) Source: Love Matches and Contracted Misery: Thomas of Brotherton and his Daughters (part 1) (Data from secondary evidence)
11) Source: Duchy of Lancaster: Royal Charters "Letters patent granting to Edmund of Lancaster the marriage of Maud daughter and heiress of Patrick de Chaworth for his son Henry."Dated: 1291. External Link
http://discovery.nationalarchives.gov.uk/details/r/C3540615. Reference: DL 10/182 (Data from direct source)