Natural Photo Combination of Grandparents

I'm looking for a skilled photo editor to combine two selected images of my grandparents into a single, natural-looking photo. They have both passed away, so this is a special project for me.

Requirements:
- Combine images with a family gathering background.
- Use the specific photos I have already selected.
- Professional enhancements, including color correction, to ensure it looks like a real, cohesive photo.

Ideal Skills and Experience:
- Expertise in photo manipulation and editing
- Experience with creating natural blends in composite images
- Proficient in color correction and photo enhancement

Please provide samples of similar work and estimated time for completion.