I'll add my praise to the other comments on Peter's photos, in particular the shot with his father. Your grandson will come to cherish this and other photographs as he gets older.
My parents and my in-laws all passed before our grandchildren came along, but I do have several photographs of my grandparents with my children. This one is of my grandfather meeting my daughter, named after his sister, for the first time.
Mamiya C3 TLR, 80/2.8, and Kodacolor 400 (which demonstrates how much color film has improved over the past 40 years)