All parents, whether married or unmarried, are obligated by law to contribute to the support of their children. Generally, the amount of child support in California is determined by: NUMBER OF CHILDREN Number of minor children of this relationship (until age 18 and graduated from high school if self-supporting, or until age 19 while still in high school). TIME SHARE PERCENTAGE Approximate percentage of time that each parent has primary physical responsibility for each minor child of this relationship. GROSS INCOME Commissions, salaries, royalties, wages,...