Uncle Albert is a jolly, kind old man who lives in a small home in London. He is the uncle of Mary Poppins, and appears to have full knowledge of her abilities.
There are roughly one-sh*t billion tropes so PLEASE look through them before adding one. Otherwise add what you like. ADDITION: PLEASE read through the trope description provided before submitting something. It's not a huge deal but too often people submit characters that don't fit just because they misinterpreted the title...