With all due respect, there is nothing biological about the family unit. It is a social construct, as evidenced by that fact that social norms related to family structure and values differ wildly across time and geography. Thousands of pages have been written about this by historians and sociologists. By the way, we are the one's imposing our way of life on our gay brothers and sisters, not the other way around! My favorite articulation of this is from a New York City billboard: "If you don't like gay marriage, don't get gay married!"
Pakistan air strikes against Taliban kill at least 25 (Reuters)
from the article: Christianity, Judaism and Islam need to break the gay taboo