Who the heck are we? In short: 

We're one big family living in the heart of Seattle. Drew has two moms. Their names are Meredith and Elyse. Drew and Jacob got married and bought a house. Now Meredith and Elyse are building a cottage in Drew and Jacob's backyard where they'll live post-retirement. Whew!

So what's a backyard cottage?

In King County, a backyard cottage is defined as a separate living space on the same property as an existing house. These units aren’t legal unless they have been established through a permit process. The property owner must live in either the house or the accessory unit. 

Backyard cottages are sometimes lovingly referred to as tiny houses, mother in law apartments, or DADUs: Detached Accessory Dwelling Units. Try saying that ten times fast.