If you are a 17-year-old female and are 5'3'' and your mom is 5'6'' and your dad is 6'4'' can inversion sit ups help you gain 2-3 inches in height and what do you recommend?

No exercise will help you gain height. You're 17, though and can still grow up until you are 21 or so. Chances are, with taller parents in your gene pool, you *will* still gain some height My Mother is 5'7 and my Dad is 6'0. I'm 5'11 but my older sister is "only" 5'6.