Just got back from a 12 hour drive and still a bit tired but, - my William Blease (b abt 1740), married Ann Rylance, (b 1742) on 21 Feb 1762 in Witton cum Twambrooks - Cheshire Bisopt's Transcripts 1598-1900. Among their children was William Blease b. 02 May, 1779. (There was another William, - born and died in 1773.) His sister, - Elizabeth, born 1768, married George Gorst and it was from that family that I am decended.
Now it might not be from the same family that your are researching, but, if it is, I have other children's names and birth dates listed here from the first William Blease if you are interested. As I said originally, I haven't bothered to go that far out on those branches as yet.
Cheers