The 59-year-old comic is best known for his appearances on both the US and UK versions of classic improv show Whose Line Is It Anyway?. In Twitter the comic wrote that his parents-in-law (the grandparents of his daughter) who are both in their eighties warmly accept the fact that their granddaughter is transgender. And Mochrie wondered why so many people who are much younger often cannot accept transgender people even if they are their kin. Although it is the first time the news has made a splash, Mochrie and his wife previously spoke about their daughter’s transition at a fundraiser for Canadian LGBT group the Welcome Friend Association. In a speech the pair addressed their daughter’s transition and learning to switch her name and pronouns. Mochrie has appeared in more than 300 episodes of Whose Line Is It Anyway?, which ran for 10 seasons in the UK and 12-and-counting seasons in the US.