well wolfie thats what they said, reason was to make sure this wasnt a "fix" marriage to get residence so he needs to go in and out a few times then if they wish to relocate they woiuld review his case
I am not arguing with you (and I know you are not either....obviously that is what the guy in the Embassy said)
BUT just to be clear (because I've read a gazillion about this)
there is NO such requirement in US law immigration as to that....what happens is
a) your bro would apply for a visa, your sister-in-law similarly files some paperwork , gazillion papers go back/forth including something like 1k in visa fees,medical exam etc
b) grueling interview for your brother where any and all details of the marriage will be reviewed (if , for whatever reason, both your bro and his wife...are in the US at the time of submitting the stuff then BOTH will be interviewed)
c) when the marriage is very recent (less than 2 years if I recall correctly) then the green card is issued for 2 years...if the marriage lasts then the Green card is not conditional anymore.....say 3 years go by.....then they can divorce......BUT if they divorce within 2 years of having the Green Card then ......the non-American has to leave