I both agree and disagree with your position...

I agree in that married couple are normally muti-income households which makes them wealthy

I disagree that it should be the role of government to incentivize or decentivize marriage

We can resolve this by allowing people to form their own "households" for tax purposes and it should not matter if they are related, married, sleeping with each other, etc.

If they live in the same house, they should be treated as a household and be taxes according to that (or individually if they desire)

I would like to see an end to all government regulations on interpersonal relationships.