That’s what we did when my second grandchild was being born. There are 11 people in it. He is 3 now, and it is still going, and two more grandchildren have been born since then. We get lots of baby photos this way, plus share jokes and other information with each other. It’s really wonderful.We kept track of everything that was happening on the sibling text thread. They might keep it going since it is a good way to keep in touch with each other.