Pleased to hear from a relation on this branch of the Cassey family! As you are no doubt aware, George was one of 6 bros (but no sisters), sons of Wm Edward and Sarah Cassey. My ancestor was Thomas Cassey, older bro of George. I've now had contact with descendants of all the bros except James and Frank.
I only have very limited details on your line. George is refered to on a letter from my Thomas to his son George Cassey my grandfather. I also think I have a copy of your George's Will.
I have done a narrative of the Salisbury/Wilton Casseys from John,1697 down to Wm Ed/Sarah. We now need email contact to be able to convey these details. New to this site, I haven't yet worked out how to start this !