<< How does a woman become queen? Is a queen the wife of a king, or the daughter of a king? That is, can a woman marry into the family and become queen? Also, when Queen Elizabeth dies, who becomes king/queen??? >>
You can't marry into the throne. When the existing monarch dies or abdicates, his/her eldest child becomes the new monarch.
Thus, the recently deceased Queen Mum wasn't the Queen, she was the wife of King Edward VI.
The current Queen Elizabeth II is the eldest daughter of Queen Mum and Edward VI (I think it's VI). The Queen Mum was actually Scottish.
Queen Elizabeth does have a husband. Forget his name....he's NOT the King, though. I forget what title he gets....
Finally, Prince Charles, the son of QEII and her hubby is the "Crown Prince" who will take the crown when QEII dies or abdicates.
That's only for England. Different countries have different "rules."