There are tax advantages for married couples. This needs to be changed to benefit only child raising couples. The days where it is inevitable that a couple would attempt to have children are gone, and we have gotten more self-centered, abortion happy, anti-family, and anti-tradition.
A couple is more likely to have two incomes, or at least capable of two incomes. Whereas a child can’t work. If anything, there should be a marriage tax increase if there are no children in the family in exchange for all the other legal, social security, employment, estate, insurance benefits.