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Our family just uses a Google Photos album where we put pictures of ourselves and our son. We send the link to people who might be interested, and then they get notifications when we put in more pictures. The rest of our family often posts things to their own albums and we get notifications of that. And anybody can comment on any of the pictures. It's not perfect, but it's a reasonably good experience. I can only imagine it would be even better if there were a single album shared by the whole extended family.