Is it normal for a mother to let her husband picture her naked girl ?

Is it normal that when i was around 8 or 9 years old , my mother and sister and father were sitting in the sitting room , i just got out from the shower , next thing i remember is my mother holding me tight , my front facing her, so my back and my naked butt were facing my father , and he took a picture of my naked back and bottom (my mom was holding me tight so i wont move ) and she was laughing alot . I remembered it now , because i have took the picture , (a couple of years ago) the picture that my father have took of my naked bottom and back from the cupboard were there are all the pictures , and have put the picture in my room , and today i was cleaning the room and found it in one of my drawers , it's not exactly a big picture , it's a small slide (if you remember the slides ,where you take picture on them instead of real picture and then see them with a projector on the wall ) .