My father in law passed before he got to meet his 3 grandchildren... Can you compose a family photo from multiple photos? What kind of photos do you need of him and the kids if you can?
Yes. The artist can "cut and paste" subjects from different photos together and then paint that scene. It's best to present your available photos in the order and have a clear idea of how to arrange everything before you submit your order. You may also find it advantageous to take pictures of the grandchildren specifically for this so that they can match the pose/angle of the father in law photo since that one cannot be adjusted.