What's the meaning of " to have a skeleton in the cupborad" ? Besides that having a real skeleton inside a cupboard, I suppose it has another meaning.Also, what's the meaning of "on speaking terms","run in the family","wear the trousers" and "your own flesh and blood?

First notebook entry: Introducing myself Hi everybody ! Let's introduce myself; My name is Iván Tirado Muñoz,I'm spanish and actually I'm nineteen years old. I was born in Plasencia (Cáceres, Extremadura), but at this moment I live in Cáceres due to I study Rigth and Business Management at Cáceres' University. The reason because I study English is that I also study in a Language school, but this is the third year I'm doing the Advanced course! Besides, this year I cannot go to class because I live out of Plasencia, so I just can go to the exams. I hope you help me to pass my exams ;) .