Family Photo Editing for 4x6 Print

I have a wide family photo that needs some editing to fit a 4x6 print. The entire background must be included. I need someone who can use photo editing software to make the necessary adjustments. When I print this on a 4x6 at Walgreens it cuts off a person on each side of photo. Can it be fixed to show everyone in a 4x6 photo. What other sizes can be offered for same price?

Requirements include:
- Utilizing photo editing software to resize and rearrange elements of the photo appropriately
- Enhancing the colors and brightness of the image for better print quality