One named Eleanor (1269 - 1298) was the first child who survived to adulthood. She was betrothed to Alfonso III of Aragon (once mentioned here), but he died before the marriage could take place. She married Count Henry III of Bar. They had a son who succeeded his father as Count of Bar, and a daughter who married the 7th Earl of Surrey.
Joan (1272 - 1307) married twice. The first was Gilbert de Clare, who had fought against Edward and his father during the Second Barons' War and had overseen a massacre of Jews at Canterbury. After Gilbert died, she persuaded her father to knight one of Gilbert's squires, Ralph de Monthermer. Ralph was about the same age as Joan. Once he was knighted, Joan and Ralph secretly married. Edward found out a few months later and angrily had Ralph imprisoned. According to the chronicler Thomas Walsingham (writing at a much later date), Joan pleaded with her father:
No one sees anything wrong if a great earl marries a poor and lowly woman. Why should there be anything wrong if a countess marries a young and promising man?
This, and the intervention of the Bishop of Durham, Antony Bek, caused the king to relent. Ralph was released and officially name to Gilbert de Clare's old titles (that were inherited by Joan), making him jure uxoris (by right of wife) Earl of Gloucester and Hertford.
Margaret, their 10th child, was born in 1275 and died sometime after 1333. She married John the Peaceful, Duke of Brabant. John had one child with Margaret who succeeded him, and several illegitimate children who did not.
Elizabeth (1282 - 1316) John I, Count of Holland, when she was 15. John was born in 1284, and the marriage to Elizabeth was arranged in 1285. They tied the know in 1297 in Ipswich, after which they lived in Holland. He died in 1299, and she married Humphrey de Bohun, 4th Earl of Hereford. Humphrey was from a powerful family who would be a very loud voice against Elizabeth's brother...
Edward Caernarvon, their last child and the only male to survive past childhood. Plenty has been said about his rule, his lifestyle, his marriage to Isabella of France, and his death.
Instead, I will go back to Antony Bek, the Bishop of Durham who spoke to the king on behalf of Joan's marriage. He had a little trouble being loyal to both King Edward and the Archbishop of Canterbury, a story for tomorrow.