Been a US permanent resident for nearly 4 years, and married to a citizen for less than 3 years. When is the earliest time that I can file Form N-400, Application for Naturalization?

I became a US permanent resident (PR) in mid December of 2017. I applied PR on my own. I married my spouse (US citizen) in the early December of 2018. When is the earliest time that I am eligible to file Form N-400, Application for Naturalization? This USCIS link states "Permanent resident for at least 3 years if you are married to a US citizen." I just tried the eligibility, but it says I am not eligible to apply N-400 now. Does that mean I have to be married for 3 years, even though my PR is not from my citizen spouse?

Another question: can a US citizen sponsor the parents in-law for PR? Thank you.

Update: My spouse became a citizen in summer of 2019. In this USCIS Naturalization Eligibility Tool, it asks "Has your spouse been a U.S. citizen for 3 years or longer?". I chose No, then the website told me I am not eligible at this time.

submitted by /u/zorro_usa84
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source https://www.reddit.com/r/immigration/comments/qm2v7k/been_a_us_permanent_resident_for_nearly_4_years/

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