The 38-year-old actress has been observing Britain's weekly National Health Service salute by "banging pots and pans" and applauding from her home in London and she fears she'll never be able to properly express the pride she has for her sister.
"I'm so ridiculously proud of my sister," she tells talk show host and singer Kelly Clarkson. "She was an elderly carer in the community before she was a midwife. She's just one of those people... She's a nurturer and she's so good and she just has that enormous mental as well as physical capacity. To our medical staff, we are just so indebted..."
The sister of the actress' partner is also a working nurse on the frontlines of the coronavirus pandemic.
"She has got two kids under five and she's frontline as a nurse and it's like, 'What do I do? I make stories for a living!'" Dormer adds.