However , Selma struggles with parenting and decides she is happier taking care of her pet Iguana Jub Jub .
As a result , he can not fulfill his promise of taking Bart and Lisa to Duff Gardens and Selma agrees to take them instead .
Selma struggles with parenting and decides Lisa is happier taking care of Lisa 's pet Iguana Jub Jub .
As a result , he can not fulfill his promise of taking Bart and Lisa to Duff Gardens and Selma agrees to take them instead .