Family Photo Enhancement

I need a photo editor to help me modify an original picture of my dad and son. I now have 4 kids in total and with dad now passed I want them all to appear walking with him in the photo.The task involves removing a small child currently in the photo and adding in four new children from separate pictures I have ready. It also should involve making the sky and surrounding sand nicer. I tried taking multiple shots of my 4 kids on the beach walking in a similar direction. Not sure if one shot is better to work with than the other so have attached all.

Ideal skills and experience:
- Proficiency in photo editing software (e.g., Adobe Photoshop, Lightroom)
- Experience in retouching and background manipulation
- Understanding of maintaining a consistent visual style
- Ability to blend different images seamlessly for a natural look

I can send a higher res version of the picture you end up using.

thanks
candice