Making collaboration groups

Sometimes me and a person in my family are planning something like a trip or have a same goal the we are researching about, and we both use chat gpt for that so, when I was researching about something I thought that it would be great if we had like a collaborative function on chat gpt , like for example- we both create a group on chat gpt and then its like a WhatsApp group but its me, the person and chat gpt and all messages are memory saved and we can simultaneously ask chat got what we are researching about and we can coordinate seamlessly- it seems a pretty good feature to consider, which can also be used in many corporate places, universities and what not..