The elderly mother of Covid-19 infected MP Nadine Dorries has also tested positive for the disease.
Earlier this week the Health minister tested positive for coronavirus.
On Friday evening she announced that her 84-year-old mother also has the disease.
Ms Dorries tweeted: "We have had my 84yo Mums results through. She tested positive
"She's a pre war baby, doing ok. Made of strong stuff."
On Monday Ms Dorries confirmed she had the disease before saying she was more concerned about her mother's welfare than her own.
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"Thanks for so many good wishes. It’s been pretty rubbish but I hope I’m over the worst of it now," she wrote.
"More worried about my 84yo mum who is staying with me and began with the cough today.
"She is being tested tomorrow. Keep safe and keep washing those hands, everyone.’
More than a dozen British MPs are now in self-isolation as fears spread about the extent of the coronavirus in the UK.
Following yesterday's briefing from prime minister Boris Johnson, unwell people are being advised to self-isolate at home for seven days if they have a cough or any symptoms of coronavirus.
It also means that only those ill enough to be hospitalised with respiratory problems will now be tested for the bug.
These are part of precautionary measures aimed at 'flattening the curve' of the infection rate so that the already overstretched NHS can cope with an influx of patients.
