I've checked maps and other sources, and my best guess is that "Glazier's" refers to what the NPS calls the "Crew's House" [farm], which is well within the area preserved by the NPS. My source is a typescript, so I can't speak for Col Millican's handwriting. The fight was also called "Poindexter's Farm" in some smaller circles, and the combination of handwriting and spelling and unfamiliar eyes may [or may not] have led to some funky interpretations, leading to an answer of "Glazier's". Anyone who has read more than a few nineteenth century letters can speak to the variety of forms a cursive "G" can assume. Someone at Richmond NPS, or the Virginia message board as someone else suggested, may have a better answer as to "Glazier's".
Col. Millican did not give his wife a blow by blow account for the Tugalo Blues, so I have to believe that the familial connection you suspect does exist. If you prove it, or have any other information on George Crawford's service, please contact me at firstname.lastname@example.org