Nowadays, a family is simply a network of people who care for each other. It can contain hundreds or two. You can be born into one or build your own. Membership can be gained through genetics, friendship, geographic proximity, work or a shared appreciation.
Assuming you were both about the same size, you were able to easily balance on the seesaw. The following image appears to be in balance, with two equally sized people equally distant from the fulcrum on which the seesaw balances.