ISO Photoshop Expert

We were all “supposed” to *finally* be there on family picture day since we were all in town but with that many people, something is bound to go wrong. One entire family couldn’t make it due to sickness and the girl in the white dress was missing from the family with the young blonde girl on the right of the large family photo. Would love to merge these 3 photos into one big family photo out in the snow for my Stepmother as my brother in law has cancer and this may be our last family photo of all of us. It’s incredibly difficult to all get together as we live in multiple states and have 3 of the guys active duty in the military. Girl in white dress can go in front of tallest guy in blue and family of 5 can hopefully squeeze to the right of them in the open space we left. Would also love if we could swap some heads so everyone is looking/smiling I’ve got more pictures if needed. This is hopefully going to be a Mothers Day gift for my Stepmother if someone can pull off this request. Thank you so much!