Capture Them Teaching Each Other
One of the joys of being an older sibling is teaching your younger sibling a thing or two (and not always the things mama wants you to share). Simultaneously, lil ones tend to hang on their older bother's every word. This connection — which some consider to be the definition of siblings — makes for a great photographic moment. They won't be looking at the camera and they won't be focused on the photographer, but rather they'll be focused on each other. And that's something mom will want to look back on in the future.