Marge is Homer's...
Wife
Bart is Homer's...
Son
Lisa and Maggie are Herb's...
Nieces
Herb is Bart's...
Uncle
Ling is Patty's...
Niece
Lisa is Mona's...
Granddaughter
Homer and Marge are Bart's...
Parents
Bart is Herb's...
Nephew
Bart, Lisa and Maggie are Marge's...
Children/Kids
Maggie is Homer's...
Daughter
Mona is Bart's...
Grandmother/Grandma
Bart is Jacqueline's...
Grandson
Bart, Lisa and Maggie are Ling's
Cousins
Abe is Bart's...
Grandfather/Grandpa
Selma and Patty are Lisa's...
Aunts
Bart is Maggie's...
Brother
Lisa is Maggie's...
Sister
Abe and Mona are Lisa's...
Grandparents
Homer is Marge's...
Husband
Bart, Lisa and Maggie are Clancy's...
Grandchildren