Simplify the following text for a Grade 9 native English-speaking person.
Original: Sylvester Junoir is useually seen with Sylvester in the cartoons when Sylvester is trying to catch a baby kangaroo named Hippety Hopper who he often mistakes for a mouse to prove a point to his son .
Simplified: Often , Sylvester and Junior 's shorts would feature Sylvester trying to capture Hippety Hopper , a baby kangaroo , to prove a point to his son .