In the episode when Kyle finds out that Ike was adopted and not his real brother, he acted like it was a huge surprise. Since Kyle is eight and Ike, still an infant, couldn't be more than a year old, two tops, how did Kyles parents sneak Ike in on him? He had to figure that his mom wasn't pregnant and Ike just 'appeared' from nowhere unless he was at Jewbilee when Ike was brought home.
The early bird gets the worm, but the late mouse gets the cheese.