I was watching an old episode of Who Do You Think You Are featuring Ian Hislop (Editor of Private Eye and regular on Have I Got News For You). He was talking about some photos as a child, commenting how there were lots of photos of him but none of his parents. His observation was that parents are busy taking photos of their children, but it will be the children in older age (perhaps when the parents are no longer around) who want to see the photos of the parents.
Don't forget to include yourselves in the family photos... childhood memories are really all about families and people you were with, far more than what makes a good photo to put on Facebook or Granny's mantelpiece.
Nowadays with tablets, phones and digital cameras it is much easier for children to get used to being behind the camera and I really recommend it. Don't worry about the technique - point and click, and probably auto-flash unless the camera isn't happy with it. Every now and then they will get a gem of a photo.