On Charles Churchill's son Thomas' page it says (truncated):
"Charles Churchill, Esq; ...by his Majesty's interest obtained in marriage, Margaret, daughter and heir of Sir William Widville. By that Lady, who was a near relation of Edward's Queen, he left [this] Thomas Churchill, Esq; his heir, who, by his wife Grace, daughter and coheir of Thomas Tylle, of Tylle-house in Cornwall, Esq; was father of William Churchill, Esq; who espoused Mary, eldest daughter of Richard Creuse, of Wycroft Castle in Devonshire, Esq; and by her had three sons, Roger Churchill, his heir; William, who was of Corton in Devonshire; and John Churchill, Esq"
citing: The Peerage of England by Arthur Collins, Vol. 1, page 336
Thus, parts of this writing by Collins applies to both Charles and at least Thomas's grandmother.
Also, (of less repute in terms of the quality of the source) says virtually the same: Burke's Genealogical & Heraldic History of Peerage & Baronetage, 40th. edition, 1878, Index MAR.