Star Begotten: H G Wells

This was a short story by H G Wells about Martian invasion. Wells inserted a line that the idea was like "War of the Worlds", but has the character's give other Sci-fi authors credit for the story, as though one of the great authors wrote it, but they can't remember who and don't even guess Wells. We follow the protagonist through his childhood and it isn't until his wife is pregnant that he goes to his club and has a conversation which changes his life. He and some scientist buddies ponder the idea that Martians are trying to change the human species through cosmic rays that would slightly change the baby in a mother's womb to part Martian. The idea is that they would have known their planet wouldn't support life for much longer and would need to relocate. They would be more accepted if they had relatives on the planet they choose to move to. They think the Martian/human half breeds would be taller than the average man, and less inclined to take ideas, like religion, at face value just because they are told to believe. They would be interested in making life better, but wouldn't take action. While they are coming up with this list, the reader knows the protagonist must be part Martian, but it isn't until the very end that his wife questions him and we find out that we are all part Martian, but don't want to believe it.