By Matt Murphy
BBC News
Ms Wilmès, who also serves as deputy prime minister, will take leave until “the end of the summer”, when her family will reassess the situation.
She says she made the move “in perfect consultation with the prime minister”.
In a statement, Prime Minister Alexander De Croo said Ms Wilmès’s choice “commands the greatest respect”.
Mr De Croo added that the minister would not officially resign from government and that her powers would, instead, be temporarily transferred to other ministers by “a royal decree”.
Ms Wilmès, who served as prime minister between 2019 and 2020, married her Australian husband Chris Stone in 2009.
The two have three daughters. Mr Stone also has a son from a previous relationship.
“The disease has suddenly entered our lives and, in particular, that of my husband, Christopher, who must begin, like far too many men, women and even children, his fight against aggressive cancer of the brain,” Ms Wilmès wrote in a statement posted to Twitter.
Mr De Croo said that he would temporarily assume Ms Wilmès’s position as foreign minister.
“In an ordeal like this, it is the spouse, the mother who comes first. I wish Sophie, Christopher and their children a lot of courage and strength,” Mr De Croo said.
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