They're ....
sisters.
He is the .....
baby
How many sisters?
one
How many parents?
two
What is it?
It's a photo
How many brothers?
Three
What is it?
a family
They're .....
parents
They're ....
brothers
He is the ....
grandfather
How many people?
six
He is the ....
father
She is the ...
mother
She is the ....
grandmother