Resolve the fight over an orange

After a hard day of work, you reach home.

Upon reaching home, you find your two daughters, who are seven and seventeen years old, fighting over an orange. Your wife has offered them other fruits, but both insist on having an orange only. At this time you have only one orange at home.

Now since you are home, your wife has asked you to resolve this fight. You request them to share the orange this time and promise to bring more oranges tomorrow.

But they are adamant and do not agree to your proposal. Each daughter insists on a complete orange now.

What are you going to do?

Photo Adaptation/ Flickr/ freetheimage