Little Jo is our niece, the daughter of my sister. Little M and Little Em are daughters of our niece. I am sure I worked it out it out in the past, but I have forgotten. I was thinking about it at work today and I could not work it out before I was distracted by work. R is normally smart about such things, but he too is nonplussed, maybe because it is Saturday night and the Scottish Doctor is visiting.
So what is the relationship between Little Jo, and Little M and Little Em? They will all get together tomorrow, but how do they connect in a formal sense? Cousins? Second cousins? Little Jo is their aunt?