Yes, unless you are receiving SSI.
No. modifications to child support is based on a change in income, or should you become unemployed or disabled.
In general, the same way that the courts determine support for anyone else - a percentage of net income. SSI recipients are not liable for child support.
At 18, you are no longer considered a child for child support purposes unless you have not graduated high school or are disabled. If the child is 18 and out of high school, you must contact the Texas AG to stop child support.
If on SSI, no. If on SSD, there's a separate child benefit check, but you still need to file for a modification in your support. see links below.
yes
yes
For a severely disabled child, support often continues into the child's adulthood.
Possibly, if the child is severely disabled.
No, but the child is potentially eligible for RSDI payments based on his disabled father's eligibility, and these payments would count toward the father's child support obligation.
Whether or not the child is disabled: Child support that's properly paid does not ever have to be reimbursed; unpaid child support is collectible forever.
No. If a child is disabled prior to the age of majority, most states have different child support guidelines. Check your state laws. In many cases it can actually continue past the age of majority.
It can happen.
If the child is disabled, then yes, child support can be ordered for life.
no
Yes, but see link
until they are 18