Published on 11-Jan-2017 09:38. Viewed 1856 times. Conor McGregor's sister is a knockout Good genes run in the McGregor family. The Notorious Conor McGregor. UFC champion and brother to the stunning Aoife McGregor.No wonder McGregor got so good at fighting. Imagine how many lads he had a go at for trying to get with his sister. Follow The Rock on Facebook and on Twitter.