You can find your grandfather's line going eight generations back to John Chew, our clan's original settler, at

http://poslfit.homeip.net/cgi-bin/genea2.pl?id=14191

The information I have on that branch comes from Kristy Williams. If you have more that you'd like to share, please e-mail me privately.

There is a Chew coat of arms that was granted in 1703 to someone who was likely a distant cousin of that John Chew (and of ours). One source I googled lists its heraldic description as

ARMS: Azure, a catharine wheel or, between two griffins' heads erased Argent. CREST: A griffin sejant Argent, goutty de sang, beaked, legged and winged Sable, reposing his dexter foot on a catharine wheel Gules.

That is, more or less, a blue field with griffins and catharine wheels.

John