Mother and Son
Mother and Daughter
Dad and son
Dad and daughter
Grandmother and granddaughter
Grandmother and grandson
Grandfather and granddaughter
Grandfather and grandson
Aunt and Niece
Aunt and Nephew
Uncle and Niece
Uncle and Nephew
Sister and sister
Sister and brother
Brother and sister
Brother and brother
Mother-in-law or Father-in-law
Son-in-law or Daughter-in-law
Sister-in-law or Brother-in-law
Step-parent and Step-child
Step-siblings
Half-siblings
Great-grandparents and Great-grandchildren
Great-aunts/uncles and Great-nieces/nephews