My sister is dating an ex-thief

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Ok, here goes. A year or so ago, someone broke into our car and stolen our stereo out of it. I was not very happy about the whole thing. There was this kid in our town that would break into cars. This kid was known in our town and the day after it was stolen, my brother saw the same exact stereo in the guy's car. He also knew we had just gotten it because my cousin used to run around with him and she told him. I don't talk to my cousin anymore either and of course we filed a police report. You're probably wondering what this has to do with my sister. Well, she started dating him and when she first started dating him, he was still in jail! Now he is out and she tells me that she didn't know everything about the stereo even though she was there when we filed the police report. She tells me that we didn't actually see him do it so we shouldn't have a problem with him. Two different cops told us that they even believed it was him. My mom says that he has changed his ways and my sister swears by it. My mom tells me that we all need to get used to it and get to know him but I can't do it because I don't think I'll ever trust him. I don't even want him in my house! What are your thoughts on this? What if my sister really gets serious with this guy? The last time I was at my mom's house he was there and he wouldn't even come into the house until we left. Does anyone have any thoughts on this? Or should I give this guy the benefit of the doubt?