<p>Most of us either have a mother-in-law or will be one, and it's not a role most women take on gladly. Mothers-in-law are traditionally the butt of jokes, declared to be nasty, possessive and interfering - but are they really as bad as this reputation suggests? Luisa Dillner looks beyond the stereotype of the mother-in-law and finds they come in many different varieties, from loveable and loyal to lonely, ferocious and scheming. She traces...