yup
yes
yup
No.
Yep
IRAs can be seized for child support. I suggest that you contact your State's child support agency. When you get an interview with them, bring all the papers relating to your child support: birth certificates, acknowledgments of paternity, court orders, payment records, etc. Be polite but persistent. Good luck!
Yes, major assets such as a car or a house can be seized in order to pay child support.
401k's can be seized for child support. For college payments or attorney's fees, not likely.
yes
The matter of distribution of child support will be (or, should have been) addressed by the court when the child support is/was decreed. If the situation has changed since the support was awarded, you may petition the court to return and re-open your case due to changed circumstances.
If the child is providing more than 50% of his or her financial support, child support will end in Texas. If not, a 17-year-old's job will have no effect on child support amounts.
yes
The State child support agency does this.