Wow, so in addition to being an immigrant that's anti-immigrant, you're also REALLY crap at maths?

I suspect his point is that four individuals in the grandparents' generation have given rise to just one individual in the latest generation.

4 grand parents + 2 parents + 1 child = 7 people. That's family growth, not reduction.

But over time his family reduces in size, right? The birth rate is less than that required for renewal.

Only if the grandparents and parents die. By having kids, he contributed to population growth. It's a really simple fact.

It's oversimplified. We can measure population growth directly, as you're suggesting, or by birth rate. The latter gives a better picture of the trend. Do you not think he will have seen all eight of his grandparents die in his lifetime? So his family is now at -1 by your logic...

You're being utterly irritating and I'll block you soon. There's a difference between population growth, and that idiot saying his family is reduced by 75, which is patently untrue. For now you're muted. Go troll elsewhere.