Third - power struggles within families also create a great way to build tension. What happens when one family member wants power over another? Maybe a son trying to prove himself over his father? A mother trying to show how much more beautiful she is than her teenage daughter? A father trying to rule his house with an iron fist?
As you can see, there are many ways the family unit can build tension throughout the landscape of your novel, and you should make sure these elements are fully developed as they'll give your character a new level of depth, too.
Check in next month for my final tension post - love and romance!