Describe the family that appears in the photograph!
There are a father, mother, son and daughter.
I am giving you this link for further clarification on the use of IS and ARE in sentences like your one.
I hope it helps.
There are a father, mother, son and doughter.
There is a father, mother, son and daughter enjoying their stay at the park.
"Is" is singular and "are" is plural.
eg. One book is red. Two books are green.
So, there is only father, we use. There is... Adding more details to your sentence makes it interesting to read. Keep on learning, Mehmet.
This family consists of:father,mather,son and niéce