Officers were called at about 9.30pm (2030 GMT) on Tuesday evening to the large house in New Malden, south of the capital, where they discovered the bodies.
“A 43-year-old woman has been arrested on suspicion of murder and remains in custody at a south London police station,” the Metropolitan Police said in a statement.
“Detectives are not looking for anyone else in connection with this incident at this time.”
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