My gastro dr did 12 biopsies today after finding severe gastritis, linear ulcers and heme, 2gparents and 2 uncles died of stomach cancer. Is 12 normal?

Biopsies. The number of biopsies is determined by the number if findings. What is more important is what the biopsies show.
No, but acceptable. In your situation, with the family history, the additional biopsies seem to be a prudent action.