My sister is 14 and has become overly attached/ clingy to our mother- for example, my mum had a BF who she saw a couple of times/ spoke to on the phone every now and again and my sister reacts by crying/ saying "I'll never forgive you" if they break up and get back together. Her actions are obsessive- checking my mums phone to see if he's texted/ being extremely confrontational if they have texted. It's like the stereotypical rebellious teenager seeing a boyfriend who her family don't approve of, but roles reversed! At the moment she's crying her eyes out because she thinks they are getting back together, even though my mum has made it clear to her that they will NOT be getting back together.