How can I get my mom to leave her crackhead boyfriend?

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I have always looked up to my mother, but lately she's been making me angry with the way she's been acting. She's been dating a crackhead off and on since the early 80s. He's the father of my youngest sister. Anyway, she doesn't do drugs and is always complaining to me how he is killing himself and how he get irritable when he doesn't have money for a "blow!" I am sick and tired of her hanging out with him, and she even brought him to my house last week!! I didn't appreciate her bringing him around my kids! She claims that she only sees him because she goes to his house to care for his elderly mother, but I'm not stupid! She's just lonely and her self-esteem is obviously low. She's asked me to hook her up with a man, but it's been unsuccessful so far. How can I get my mom to realize that she's risking her life by hanging out with this crackhead? He's a criminal, too! He kept asking my mom to tell him where her landlady would be to collect rent so he could rob her! Thank goodness Mom never told him!!!