While they may pay a role in the day to day life of their spouse’s children, step-parents cannot be ordered by the court to be financially obligated to their step-children. In fact, use of a step-parent’s income in child support calculation is prohibited...
As far as the court is concerned, step-parents have no obligation of support for their step-children. The use of a step-parent’s income in the calculation of child support is actually prohibited by Texas family code.