The problems start here: Robert de Cherleton
He has been assigned, probably unreasonably, as a "son" of William de Cauntelo and Melisande de Gournay; but they are of Buckinghamshire and he is cited as born at Charlton Musgrove, Somerset. His family is also said to have held the manor of Charlton in Shropshire from the abbot of Shrewsbury for several previous generations. All of these things cannot simultaneously be true...are any of them?
His wife is named as Elinor de Cherleton (born Holand), daughter of Sir Thurstan de Holland; but the Hollands were at this point a Lancashire family, and while Sir Thurstan is credited with some nine or ten sons by two or perhaps three wives, there is no record of any daughters. And she also screws seriously with the birth dates of Sir Robert's sons, as her own birth date cannot be much before 1250 and possibly later.
Thomas Charleton, Bishop of Hereford cannot have been the eldest son - heirs were not allowed to enter the Church. Thomas de Charlton is recorded as Lord Privy Seal (then a clerical, not a secular office) 1316-1320 and as Bishop of Hereford 1327-1344. And *churchmen did not marry*, although some of them (against official policy) had mistresses.
John de Cherleton, 1st Baron of Cherleton - his birth date is given in Wikipedia as 1268, not 1286. Wikipedia is not authoritative; but an earlier rather than a later date is argued for by his prominence in the royal household from c. 1307.
Sir Alan de Charlton, of Appley Castle was certainly a younger and possibly the youngest son. He has been cited as marrying both Ela Charlton and Margery de Charlton, though in which order is much disputed. The matter has been "solved" here by replicating the previous generation and assuming a "Sir Alan de Charlton II" Alan de Charlton, II who predeceased his father. (This also resulted in two "throwaway" brothers with the exact same names as the 1st Baron Charlton of Powys and the Bishop of Hereford, but of no significance whatsoever.)
However it fell out, the line came down at this point to an only (surviving) son, Thomas de Charleton of Apley Castle, who had an only (surviving) daughter, Anna de Knightley, whose husband William de Knightley took her name.
Sir Thomas de Charlton's wife Anne de Charleton is not given in Burke, and the Visitations, as they sometimes do, have gotten the earlier generations impossibly garbled up. I find no justification for naming her a FitzAlan, and note that she has no connections.
The real mess starts here: Robert Charleton of Apley (Burke burkes the issue). That a Charlton of Apley, Shropshire, should marry a Shropshire Corbet is not to be wondered at - but that he should marry one twelve years his senior??? And with a mother Margaret Mallory who is NOT who she is presented as here? (Margaret was a Mallory by her second marriage ONLY - she was NOT born one.)
And it gets worse....