My son has been dating his 20 year-old girlfriend for a year. My husband and I have noticed she is always taking advantage of him - as he spends most of his money on her! She's snooty and everything she wears has to have a designer label - Tiffany, Coach, Kors. He spoiled her rotten on Christmas and spent at least $500. She's a liar and very needy and controlling. She monopolizes my son's spare time and trashes his friends. She is trouble with a capital T. How can I convince him she's a mistake? Is it my place to do so?Signed - A Concerned Mom