Tuffy (also called Nibbles) was Jerry's nephew and also a little grey house mouse who is close to Jerry and appears frequently with him, especially in the comics. He is sometimes seen as Jerry's nephew, but occasionally referred to as an orphan. In many cartoons, Nibbles is seen eating a lot (he is always hungry). In his first animated appearance, he was left on Jerry's doorstep, abandoned by his parents. Tom enjoys chasing Nibbles much as he does with Jerry.
Tuffy appears in Tom and Jerry.
He also appears in the 1999 cartoon show Tom and Jerry Works, voiced by Sydney Penny. There he is often called "Nibbles", his alternate name.
Nibbles putting his diaper on.