I come from a very tall family.  I am 6 foot 6. I think the population are getting taller and taller with each new generation.  What do you think?
I agree. Measuring from the bottom of my feet to the top of my head, I'm only 5'4", so you're a lot taller than I am. 
Are your parents tall? I think it is interesting that we take so much from are parents
No actually. My mom is shorter than I am and my dad was average height. There's a genetic profile in males called Y haplotype I-M170 is related to height.
Oh is that right? and what does it mean?
It's a Y chromosome DNA haplogroup.
Oh ok.  I dont know alot about that.  Does that determine your height then?
Yes it does. It's also one of the common haplogroups with European males.