BennetM1,
If your grandfather was a pilot then he would have had a pilot's flying log book - I guess that this has not been found.
Had he served in another squadron before joining 48 - for instance I know of a chap, hopefully still alive, who completed a tour as a pilot on Lancasters with Bomber Command and then was posted to Daks initially in Burma and then other locations further east. After that tour he returned to civilian life and never flew again! Now a well known aviation artist.
I have sent the 48 Sqn association secretary an email to tell him to expect a message from you.