Hunter Bidens daughter and Obama girls were tight. So was her mom and Big Mike.

https://www.newyorker.com/magazine/2019/07/08/will-hunter-biden-jeopardize-his-fathers-campaign

"Their daughter Maisy was in the same class at Sidwell Friends as Sasha, the Obamas’ younger daughter. The two girls became close, and Kathleen and Michelle Obama became friends, attending SoulCycle and Solidcore exercise classes together almost every day. Some evenings, they went out to dinner or had drinks at the White House. Kathleen went on vacations with Michelle, mutual friends, and their daughters."