Booking soft sleeper cabin

Hi, I am planning to book a soft sleeper cabin for my trip from Kunming to Dali. There are 4 of us. If I book 4 tickets, will I have 4 of us together in a cabin or will us be split up. I do not want us to split up as out of these 4 people, 2 are elderly and I need to look out for them. Can someone advice?

Thanks