Family Photo Enhancement

I'm looking to add a person into a family photo. The source of the person's photo is another picture from the same event. Ideally, it should be a seamless addition that requires basic blending. The final deliverable should be a digital file.

Skills and Experience:
- Proficient in photo editing software (like Photoshop)
- Experience in basic image blending
- Attention to detail to ensure a natural-looking result