Brick is nothing like his older sister. He is very messy where she is very neat, and he is very lazy when she is very active. He's also very playful, unlike the serious Natasha. He probably won't join the military like his grandfather, father and older sister.
His grandparents are General Buzz and Lyla Grunt, and Arty and Daisy Loste. Ripp and Buck Grunt are his uncles. He has four cousins, Gertrude and Dana, through his Uncle Ripp, and James, Buchanan and Rocky through his Uncle Buck.