Jerry will return home frustrated everyday, smashing things to vent his anger, and hating Raymond more. That includes Alex, as he felt like Raymond has switched his attention towards Alex.
He doesn't care about the boy, because he didn't ask the girl to conceive a child. It's just a one time thingy and he's stuck with a baby. But he knew Alex is the way to make his brother come around, which was why he accepted the boy in the first place.
Whenever he is out working, he would look serious because he knew he was being monitored. He knew that's what his brother will do. Despite being so successful in the business world, he has the softest heart of all.
After some months, he managed to convince Raymond again that he is serious, so he opened all his credit card he blocked and finally left him to take care of things concerning his son's well being, believing he's a changed man.
