The star is looking after his four children Junior, 14, Princess, 12, Amelia, six, and Theo, three, while Emily MacDonagh is on the front lines for the NHS.
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However, because she is working to look after the nation's sick, they are having to limit exposure to each other so the bug isn't potentially passed on to the rest of the family.
Speaking on Good Morning Britain today, the Mysterious Girl singer said: "Here's the thing, she obviously doesn't tell me a lot of stuff because of confidentiality.
"But obviously because she's now exposed to the virus quite a lot, at the moment, in the last few days, it means right now we are having to be in separate rooms.
"I am the one who has to have the kids as well and I'm terrified they will get it."
He added that Emily is his "absolute hero" – along with the other NHS staff.
Peter – who shares his youngest two children with Emily – recently expressed his pride on Instagram about his doctor wife.
He shared a photo of a group of NHS workers in a hospital, holding signs that read: "We stay here for you, please stay home for us!"
The proud husband added an arrow to point out Emily, who is seen crouching in the front row and holding up the sign that reads: "Please".
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He added the Stay Home geotag to the image as well as a "Thanks health heroes" GIF.
Peter shared the post to his Story as well as his main page, adding the caption: "Proud 🙂 #SupportTheNHS.
"Thank you so much to ALL the NHS and the carers up and down the country."
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