Is it reasonable to expect that I will no longer be paying him child support for the two youngest?

>>>>>>>>>>> With a larger income he'll probably be paying you . The PA guidelines are available here :

http://www.pacode.com/secure/data/231/chapter1910/s1910.16-4.html

Any clue if he can still take me to domestics and file for a modification demanding that I pay for secondary education? I think he intends to try to include my husbands salary, but that won't be permitted.

>>>>>>>>>>> Post-secondary expenses can't be ordered .