All my sisters have blonde hair while mine is brown.
That is odd I wonder why?
I'm not sure, luck of the draw I guess? Blonde hair is generally characterized by low levels of the pigment eumelanin, so I guess I have more of that.
Oh ok I have no idea what determines hair color but it sounds interesting
It's funny that it used to be called "fair" instead of blonde, but over time fair now refers to light skin instead of light hair.
what makes red hair red
It has high levels of the pigment pheomelanin and low levels ofeumelanin. 
Makes sense what else do you know about hair color?
he darker a person's natural hair color is the more hair follicles they have! And melanin levels can change over time.
its interesting that the levels change over time so I guess hair color would change as well?