There are other things besides your parents’ height that can factor into how tall you will be, like nutrition and health. Anything besides waiting until you are an adult is just a guess.
Our former pediatrician (only because we moved, not because we didn’t like him!) had a rather unique way of predicting height. He used an average of the parents’ adult measurements adjusted for sex. So, your predicted adult height would be halfway between your dad’s height and your mom’s height if she’d been male: six inches taller than she is now. The math would look something like this:
6’5” + (5’4” + 6”) = 12’ 3”
12’ 3” / 2 = 6’ 1.5”
Your estimated adult height would be 6 feet, 1.5 inches.
For your sisters, the estimate would be the average of your mom’s height and your dad’s height if he’d been female: six inches shorter.
So clearly it’s flawed, because your sisters would be expected to be only a couple of inches taller than your mom. However, we tried out this formula on ourselves and our siblings and found it to be very accurate. My brother and I are both exactly the height the doctor’s formula would have predicted. So are my husband and his sister.
Sad news for our kids, because they’ll be short. :) Anyway, I’d guess that if your sisters are taller than expected, you probably will be too. I’m sure you’ll hit a growth spurt soon and go through 6 pairs of shoes in one year, just like my baby brother did. He’s six foot four.