If my grandma has high blood pressure but my mom does t is it possible that i could have high blood pressure?

Probably not : Your concern is a good one, but may be a bit early. Please get your BP checked over several days to ensure that your pressures are normal (should be). Being overweight, elevated cholesterol, high salt intake, have been associated with elevated blood pressure but young vessels typically are very elastic and don’t show elevations as readily as older folks. Eat healthy. Exercise, get sleep. Goodluck