For the purpose of child support, new spouse's income doesn't co

... "Guideline child support" in California. Absent extraordinary circumstances, a new spouse's income may not be considered by a court in determining or modifying a child support order. An extraordinary case exists "where excluding that income would lead to extreme and severe hardship to any child subject to the child support award."

http://www.huffingtonpost.com/mark-baer/new-spouse-income-and-chi_b_4361676.html

Never say never, but I don't think in our case the ex is in "extraordinary circumstances".