Dear Miriam,I am organising a hen party for my sister later this summer. However, there are two girls in the group who were previously friends, but have fallen out with each other in recent months. I’m not really sure what it’s all about, but it’s causing some awkwardness, to say the least.What is the best way to handle this situation? It’s not like I can invite one and not the other and I don’t want to stress my sister out either in the run-up to the wedding. I would appreciate any advice you could give me.