<human>: Can you summarize the given text in a few sentences?

(throwaway for obs reasons)
So my sister a few months ago really got into this game and started playing it a lot and streaming it on twitch. While streaming, she met a man in Sweden (we live in the USA btw) who's apparently really good at that game. This man always donated to her channel and they started talking and got really close.

I should hasten to add that this man who lives half way across the world appears to be a total loser. He's obese, he's a college drop out, and the only thing he seems to do is play video games.

After talking for several weeks they began a long distance relationship and she has even bought him a plane ticket (with her own money) to come visit her from Sweden.

Naturally, although I understand that it is wrong to judge a book by its cover, I must admit that I absolutely do not approve of this relationship. I think my sister is being immature and does not know what she's getting herself into with a man 7 years her senior. I mean is this even legal?!

Much to my dismay, my parents do not seem to care that much and professed that she can do whatever she wants. And is actually allowing this man to come visit her with the plane ticket she bought him.

I'm at a total loss for what I should do. On the one hand, I feel like as a good older brother, I should not let her date this man and possibly be taken advantage of by this person who seems like a complete loser. On the other hand, I feel like it is not up to me to decide who she decides to fall in love with and I don't even know what I can even do.

Reddit, what should I do in this situation?
<bot>: My sister wants to date a man 7 years her senior who in my judgement, is not fit at all to date her