<human>: Sister and I live in Minnesota, fiance is from Chile 

Hi, I'm asking this on behalf of my sister because she doesn't go on reddit so I asked her if it was okay that I posted about this; I will be showing her the responses.

So my sister has been with her fiance for just over a year, they met when she was studying abroad in Chile. They met and hit it off right away, stayed together throughout her 6 month stay in Chile, and have been doing long distance since. There were a couple times where they visited each other, he came to the USA for 3 months and stayed with her at one point, she went to Chile for a month to visit him, and they've decided they want to get married.
I'm so super excited for her, this guy is awesome and makes her the happiest I've ever seen her, well, EVER. But she was talking with me last night, and apparently this whole marriage thing is going to be difficult.

Her fiance who we'll call Jorge, wants to permanently move to the USA. The job field he is in has way more opportunities in the USA and he doesn't have a great home life in Chile. They discussed him coming to the USA and working on getting married through the government and then having just a reception after, but we are all wondering how that works. They did some research and apparently he can stay past his 3 month tourist Visa so long as they are working on getting all the marriage legalities worked out, but I am questioning this (it sounds illegal) and she, Jorge and I are wondering if there is a better way to do this.

I guess my question is: How do my sister and Jorge get married, and how does Jorge get his green card without having to fly back to Chile multiple times? He is coming to the USA in May and they want him to try and get his green card in the meantime. Any suggestions for other subreddits where I can crosspost would be FANTASTIC.

Provide a brief overview of the text.
<bot>: sister and fiance want to get married, fiance is coming to the USA in May and we want to help him get his green card and have them get married, not sure what to do