Re: Superman Returns: Did Richard Know?
I don't think Richard knew, nor did he care who the father was. He was in love with Lois and accepted her regardless of her past or current situation. He at least knew that Lois was romantically involved with Superman, but that doesn't mean Richard assumed Supe fathered a child with Lois.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."
--Bilbo Baggins, LOTR: Fellowship of the Ring