17: Favourite parent; and how to respond when teenagers want to ‘express’ themselves? Blue hair? Tattoos anyone?

Send us a textDo you have a teen at home who's all sweet and loving with one parent, but treats the other like they're a bad smell? Karen says she feels like running away because she's walking on eggshells in her own house, with a daughter who is rude to her but sweet and kind to her husband.Why do they do it and how can we, as both a parent and partner, make things better for everyone? Also, it's been around since the Ancients: Personal expression using hair dyes, make-up, nail varnish,...