I'm a 18 year old guy and 175 cm tall , but my older brothers and dad are all at least 187 cm. Can i grow taller?
Unfortunately, you do stand a chance of growing a little bit taller by the time you get to the age of 20. Your growth is determined by a number of other factors; including your diet as well as your hormones and genes.
Yes, you can get taller based on your parent's gene. So since your dad is tall, you'll likely be tall. But also a healthy diet and exercise has a little part in it too.