This week, Tristan Thompson's mother passed away unexpectedly, by heart attack.

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On January 5, according to insiders, Andrea suffered a heart attack at home.

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Despite being taken to a nearby hospital in an effort to save her life, Andrea tragically passed away.

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Since then, Thompson has made the long journey from Los Angeles to Toronto to be with his family during this troubling time.

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Last night when they disembarked from a private airplane, Khloé Kardashian was spotted standing next to the NBA player.

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Thompson and his mother appear to have had a close relationship since she was frequently seen in

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seen in images with his daughter, True, whom he shares with Kardashian.

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True, age 4, and a boy they welcomed via surrogacy in August make up Thompson and Kardashian's current family of two.

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Theo Nichols and Maralee Nichols' son Theo and Jordan Craig's kid Prince are both Thompson's children.

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