There are indeed 4 McGanns - Joe, Mark, Steve (currently in Call The Midwife) & Paul. Brother, not twins or triplets or quads. Met all of them apart from Paul as a spotty, specy teenage fan & they were all lovely - polite & considerate and coped so nicely with my stumbling attempts at adulthood. From the article, Joe seems to have merely disagreed with Wallace - surely that's allowed as adults / humans? This sort of thing is why one of our house rules is "Never join Twitter" (along with no naked photos, never type what you couldn't say out loud & only take organic drugs) - no matter how good intentions / desire for debate, it's just not worth it.