Filthomena (niece)

.  Filthomena  is  Oscar the Grouch 's young niece, a Grouch baby. Her mother has been shown once, but never her father. Whether she is the daughter of Oscar 's brother  Ernest  or  Otto  or his sister  Bunny  is unknown.

In a 1989 book, When  Oscar  Was a Little Grouch & Other Good-Night Stories, Oscar  is seen babysitting  Filthomena .

 Filthomena  is also a Grouch girl who attends  Oscar 's Grouch Reunion in the 1989 book What's in  Oscar 's  Trash Can ? &amp; Other Good-Night Stories. She swims in Oscar 's pool with  Grundgetta,  Oswaldo  &  Fluffy.

Books

 * When  Oscar  Was a Little Grouch &amp; Other Good-Night Stories (1989)
 * What's in  Oscar 's  Trash Can ? &amp; Other Good-Night Stories (1991)
 *  Oscar 's Grouch Jamboree (1994)