Aoife Martin said she was "petrified" about coming out to her sister as a trans woman.
She'd already told a few people - her GP, counsellor and a few very close friends - but Lisa would be the first person in her family to know.
Aoife told indy100:
I was pretty sure she was going to be fine about it, but you never can tell.
Thankfully, she explained:
I couldn't have hoped for a better response.
Sharing a series of text messages she exchanged with her sister, Aoife wrote on Twitter:
Her sister's response (in grey) was lovely
While coming out to her sister turned out to be a happy experience, Aoife, who lives in Ireland, said that even in the modern day, being a trans woman is no easy thing - although there is cause for optimism in the future.
I think it's hard to be a trans woman anywhere. Ireland has come a long way and we have a long way to go but we now have same sex marriage and also trans people are now free to self-identify.
We can have our birth certificates changed without needing surgery or a letter from a doctor. It's much easier now than it's ever been, but it's still a very difficult thing to be.
It's good that we should have some positive stories.