At the end of the day your have TWO children to support. They are BOTH yours and you need to treat them fairly - NOT make your son go short, so your daughter can go to college. What sort of father does that make you ??
But to answer your question, yes in SOME instances you can apply to have the child support payments lowered. But you would have to justify why - something like you have lost your job and are living on unemployment or lost your job and got a much lower paying one.
Not sure where you are in the world, but where I live college is a luxury and not a necessity.
But you really need to see a lawyer that specialises in this sort of thing and take it from there.
You would have to go and petition the court in order to lower child support payments. However, don't count on them being reduced. You still have a responsibility to support the other child too.
Your son still needs support, not fair to him to cut support so you can spend more on your daughter. Be a good father to both of your kids and don't play favorites. Have your daughter gets more loans for college then when your son goes give him and her equal amounts she can pay down her loans and he can get fewer loans.
No way. The amount of your child support is determined by your income and has no bearing on your expenses. Sorry.
Sure, your son will eat less so your daughter can go to college. LOL I am actually hoping you're a troll because if you're for real - my God, you must be a moron.
The answer to your question is yes. However, You should say what state you are in. That way I could give you more details.