The "Rocket Man" hitmaker spent a few nights in intensive care in April after he fell ill while travelling on a flight back to the UK from Santiago, Chile.
Furnish, who has sons Zachary, six, and Elijah, four, with John, says it was a testing time for the family, reported Daily Mirror.
"We were all very frightened and very scared. The kids understood daddy wasn't well. They didn't know the seriousness of it, obviously, but they came to visit him in hospital as that was an important part of keeping the patient's spirits up.
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