Very commonly used and inconspicuous excuse for getting out of pretty much anything. One can replace the word 'brother' with any relative that would make sense. Possible substitutes include but are not limited to:
Sister, Cousin, Nephew, Niece, etc.
(Guy 1) Hey Guy 2, wanna hang out?
(Guy 2) One sec... Nah, I have to take my brother to baseball practice.
(Guy 1) Hey Guy 2, wanna see a movie with some friends?
(Guy 2) Can't tonight, I have to take my brother to baseball practice.
(Guy 1) Hey Guy 2, wanna play some football today?
(Guy 2) Sorry man, I can't play today. I have to take my brother to baseball practice.
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2million.