There are some things Kourtney Kardashian’s son, Mason, can’t live without—his extended family, fashionable clothes, and his pet fish. It’s no surprise then that life gets a little complicated once Khloe Kardashian discovers one of the family’s fish is dead, and still in the fish bowl.

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At first, Kourtney doesn’t believe her sister and looks for herself. Once her fears are confirmed, Kourtney asks Khloe to get rid of the family pet before Mason notices. What comes next is classic Kardashian sister bonding as the two figure out a way to flush the fish down the toilet.

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Tune in for a new “Keeping Up With The Kardashians” Sunday night at 9 p.m. followed by the premiere of “Married to Jonas” on E!