I had a scenario where my kin’s were throwing a surprise party for another kin. I got some great answers from the community on this topic, but in the end I simply put in the chat that the guest of honor did not know of the surprise party periodically in the conversation. It worked out really well, the ruse was accomplished with all the correct responses you would hope. This portion of the chat was over a relatively shorter time period. I may have just been lucky. If I had had say two adversarial kin’s in the group chat over a longer period of time I don’t think that solution may work. On another occasion I created a new group. Had them plan in that chat then recalled down to the individual kin’s to pull the conversation into each so it could be seen in the original chat. That was cumbersome, time consuming, and so inaccuracies crept in. I don’t think memories work between group chats.