Brother Brat is a 1944 Warner Bros. Looney Tunes theatrical cartoon short, directed by Frank Tashlin. It was released on July 15, 1944, and stars Porky Pig.

When a mother goes to work in a factory during World War II, Porky Pig is hired to baby-sit her son, Butch. He quickly finds out that the baby is a violent-tempered infant, named Percy (nicknamed Butch). He tries to use a child psychology book to control the baby, but to no avail, including a scene where the baby does a Winston Churchill impression; "Of course you don't know, this means war!" Eventually, at the end of the cartoon, the mother returns and asks Porky if he used the book. He then replies that the book did not work, but the mother says that he didn't use it right and then uses the book to spank the baby.