How can I handle this depressing situation?

One of my daughters is always broke, has taken drugs for decades, lives mostly on handouts and a strange online real estate website (renting apartments), has a strong feeling of entitlement and her son (who we helped raise) is so much like her. He actually has a court date and she always finds the means to skip town when either has one. The Knights of Columbus gave her a free car and her boyfriend may get her a new radiator after her recent wreck . She mentioned coming to visit us. Her son has stolen jewelry from me, a video game from his cousin and was engaged in “cold water extraction” when he was here two years ago for a few weeks. He took a bottle of my s/o’s Vicodins home when he left . She likes a frantic life, each day full of major drama. If she finds herself with a calm day she ruins it . What words should I use should they show up so they know we want them gone? I haven’t seen her in three years. I hope she’s not planning on leaving him here so he can skip his court appearance but that’s something she’d try to pull. She is determined he never sees the inside of Juvenile Hall or jail. Recently, he was a passenger in a car that flipped three times and they found meth and a stolen computer. It’s like this constantly. She allows him to not attend school at all. I do not know how they get around this. My other daughter is a normal, happy, productive wife and mother. I hate to order her to stay away (500 miles) but don’t know how to handle this. Help?