How is Homer related to Bart?
He's Bart's father.
Is this Lisa's mother?
This is Lisa's brother.
How are Lisa and Bart related to Homer?
They're Homer's children.
Is this their mother?
This is their mother.
Is this Bart's sister?
This is Bart's sister.
Are these their children?
These are their parents.
How are Homer and Margie related to Lisa?
They're Lisa's parents.
Is this their father?
He's their son.
Are these their parents?
These are their children.