I think this a subject that requires research. An important piece in the identical siblings biological similarity jigsaw. I shall offer my services to carry out the research myself
Journalists. It starts off by banging on about them having "exactly the same lifestyles", then says one of them is in a long-term relationship and another is single (I couldn't be arsed reading on to find out about the third - she's probably a man).
So while on holiday my wife and teenage daughter ar giggling away at the teenage lad who keeps smiling at my daughter, I notice the Man Utd wrist band he's wearing and speak up. "What are you smiling at?" Said in a quite seirous tone. Man Utd fan ****s off. Daughter and wife stop giggling and stare at me. Life eh?