Combine Photos into Seamless Family Portrait

I need help combining three individual photos into one cohesive and natural-looking family photo. The final image should look like a single, authentic photograph. Here are the challenges: the photos have different lighting and color tones, the individuals are positioned awkwardly, and the backgrounds do not match. I prefer to use one of the existing photo backgrounds for the final composition. Ideal skills include expertise in Adobe Photoshop, attention to detail, and experience in photo manipulation to achieve natural and cohesive results. Let me know if you have any questions or need additional details before bidding.