Photo Merge for Family Portraits

I need two family pictures combined to create the perfect portrait. The first choice would be to replace the lady in the black dress with the bent arm (holding wine glass) into the photo where everybody else is smiling. If it’s not possible to replace the entire body of the lady in black dress, maybe switch the smiling face of the gentleman on the far right onto the bent arm photo.

Requirements:
- Merge faces from both photos.
- Replace my entire body in one photo with the other, if possible.
- Experience with photo editing software is ideal.

Looking for seamless integration and a natural look.