Current options for printing an image for a locket

Hi community friends.

I would like to print a picture small enough to put in a locket however I believe that I will need to create the picture from other pictures. My daughter just had her first baby just a few weeks after my grandmother passed away so she was unable to get a five generation picture for her and her baby. I believe the simplest way would be to remove my oldest daughter and her baby from a five generation picture taken 17 years ago and somehow add my other daughter holding her baby. Does anyone have any idea how I might be able to do this? The

other option I was thinking of is right before she passed away. We took five generation pictures with my other daughter and my now 17 year-old grandson and 13-year-old grandson. There is a picture where my grandmother my mother and I are sitting next to each other. is it possible to just the three of us and have that potentially be the locket picture just me grandmother, my mother, great grandmother, and my mother's mother great great grandmother. I do have an iPhone 15 as well as an iPad which I purchased in 2019. I apologize I don't recall with that iPad was as far as whatever generation that is.