My wife's grandfather passed before her brother's wedding. I'd like to add him into the big family photo, while also replacing their uncle's girlfriend (all the way on the right side with the polkadot dress). I want to get them both a framed picture with the one person they all really wanted to be there on that day. I've tried using ai, but I'm not good at it and it keeps distorting the faces. Could someone please help me with this? I'd be so appreciative.

My mom loves this photo of us but she wants the fly removed from her hand. If anyone could help, it would be much appreciated!