Chad Lowe’s daughter Mabel shares heartbreaking tribute to late sister Fiona, 13

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Chad Lowe's daughter, Mabel, mourned the loss of her younger sister Fiona.

Mabel, 17, shared a carousel of images with her sister in a heartbreaking post shared on social media over the weekend.

Fiona died at a Los Angeles hospital on Sept. 29, according to the County of Los Angeles Medical Examiner's office.