Dramatic mood swings are typical of adolescence but are very tiresome for the rest of the family.
Be patient and accepting. Teens want independence from parents and family as they enjoy the opportunities of adulthood.
But that independence also brings times of self-doubt, uncertainty, worry about the future, worry about popularity, sexual insecurity and a host of other uncertainties. Sometimes it all becomes too much. Then they may find it re-assuring to fall back on childish ways and nestle in the security of the family.
Such mood swings makes it quite hard at times to know how best to react.
Try negotiating house rules of reasonable social behaviour and be firm about everyone living by those basic rules. Be patient and non-judgmental when rules are broken.
Sometimes the moodiness can be a symptom of something more serious however, so be prepared to get professional advice if you think there is a need. If in doubt, trust your instincts and talk to a professional such as a school guidance counsellor or other counselling service. Some specialise in youth counselling. There are a number who provide telephone counselling services such as, Parent Helpline (0800 4 PARENT 0800 472 7368) operated by Barnardos.