Ok, the basic rule, the general rule,  is that unless you adopt step-children you are not liable for childsupport/Support Orders etc..

Under certain circumstances, the extraordinary income of a new spouse/household member, can be considered i the court's discretion when determining both

the income of the nonresidential parents Worksheet/support "income" as well as the overall transfer payment (which is the monthly check that must be cut by the obligor for childsupport).