K-2 Visa Question

[TexasMojo66 3]

I am looking to get some clarification on eligibility for a K-2 Visa. My fiancee's son is currently 17 years old and we have him listed in the I-129F to come on a K-2 visa. The USCIS website states that a person is eligible to accompany the K-1 fiancee on a K-2 if a)they are under 21 years of age, and 2) unmarried which he meets both criteria. However, I have also read on the website that a stepparent/stepchild relationship must be established before their 18th birthday (I interpret this to mean that my fiancee and I must be married before he turns 18). I am looking for some reconciliation between these two statements as his 18th birthday may occur before my fiancee and I will be able to marry (at least following our current timeline estimates). Any help would be greatly appreciated.

[Enigma11561 336]

For K2 visas the single child must enter before their 21st birthday. This will allow them to adjust status. My wife and I married before her son ( 20 years and 11 months )entered the US. There is something out there about the 18 age, do not remember, but I do not believe this has to do with K2 visa.

[kitkat1985 2]

Did you read that under the K1 visa requirements or somewhere else on the website that could mean for the spousal visa....

[TexasMojo66 3]

Thanks Enigma! Kitkat - I read it on the USCIS website under K-1 info (FAQs). The question was "does my USC fiance have to file separate petitions for my children?" There is an IMPORTANT NOTE that says "stepparent/stepchild relationship....etc." This seems to deal with Adjustment of Status. Also, there is a hyperlink at "child" that sends you to the USCIS definition of child. Again, it says unmarried/under 21 and below the 18yo requirement again. It's a bit confusing to me so that is why I was putting this out there to see what others have seen/done, etc.