Seamlessly Insert Missing Relative

I have a cherished family group photo that unfortunately doesn’t include one important relative. I can supply you with several clear shots of them taken from different angles, and I’d like you to blend them naturally into the existing picture so it looks as though they were always there. The final composite needs to match the original image’s lighting, color tone, and perspective. Please place the relative between two specific family members already in the scene—I'll point them out once we start. No stylized or portrait-style edits; it should look completely authentic. When the retouch is finished, I’d like: • A full-resolution JPEG ready for printing • A layered PSD (or TIFF) so minor adjustments are still possible If you do your compositing in Photoshop, that’s perfect—just keep the layers organized. Let me know your turn-around time and any questions you have about the source files, and we can get started right away.