My neighbor and her boyfriend are on meth and have three children in the home. It's quite obvious by the condition of her skin and her constant twitching and moving that she has it bad. Her children seem in good spirits and are clean and fed, but I constantly worry about them. I invite them to my house almost everyday to come play with my oldest daughter and the girls have all developed a very deep friendship. I try to be somewhat friendly to their mother and we chat in passing. I love her kids, but wonder how their upbringing will affect my children. They are always supervised at my place so I know what's going on. Are my fears unjustified?