If you're new - mini sessions are short 15 minute back to back sessions in one location of my choice. I do these once per month and they are designed for individual families. However, I hate making strict rules about anything. In my experience it doesn't work very well with big groups. It is HARD to make sure everyone is there and ready on time with such a short time slot. There isn't enough time for very many combinations, it's not enough photos, and sometimes the space isn't meant for a large group. However, depending what your main goal is - I've seen it work. Ex. You only want photos of Grandma with grandkids.