NameJohn Carsewelle 
Birthbef 1332, of Yatesbury
Deathaft 1396
Notes for John Carsewelle
John may or may not be related to William, but as he is mentioned alongside him, I have simply placed him here to show a possible, but obvious, connection.
In the Edington Cartulary vol 36, p 153, -588, John Carswell is mentioned as a witness to a charter of Thomas Webbe of Bourford, dated 1 5 Sep 1394.
He is mentioned, same page, item 590, on July 1 1396, as a witness to a charter of John Lake of Langeford, Berks.
Also, item 596 on 21 Dec 1361, in a charter of John Laundels, granting in fee, with warranty, to the rector and brethren of the house or monastery of Edington property in Westwell.