Whats the probability that i hit My dream height?

Im currently 5 foot 9 at 15, my dad is 5 foot 10-ish, my mom is 5 foot 4-ish (idk my parents true height) and I have two brothers. One is 5 foot 11 and the other is 5 foot 8(Both already adults) . My dream height is 5 foot 11 at least like my brother, since im already bigger than my shorter brother i think my chances look pretty good. What do yall think?