What can my family do about my sister literally dating an illegal immigrant? Isn’t it dangerous for them to be dating? Why do you think she likes him?

My sister is dating an illegal immigrant from Mexico and he speaks okay English actually but he isn’t a citizen. He builds the roofs of houses and was hired for cheaper labor. He has his own car and has been here for a year and a half.
My sister is way too beautiful. She has options and I’m sure of better options but instead wants to date an illegal immigrant? Why?
What can my family do about my sister literally dating an illegal immigrant? Isn’t it dangerous for them to be dating? Why do you think she likes him?
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