Final answer:
The best comment to make is asking whether the camera will be used by the children or just the customer, which acknowledges the family and can lead to a discussion about user-friendly camera features like auto-focus and scene modes.
Step-by-step explanation:
The most engaging and appropriate comment a sales associate could make to a customer with two children looking at digital cameras is: "It's a great day to bring the family shopping. Will the children be using the camera also, or just you?" This approach acknowledges the presence of the family and shows consideration for the potential usage of the camera by different family members. It opens the conversation to discuss features that may be relevant to the children such as auto-focus, which simplifies photography, making it easier for them to use, and scene modes like Portrait or Landscape which are user-friendly settings for capturing great photos.