Is it weird my dad’s ex-coworker added me on Facebook but not him?

I need some advice on a slightly awkward social media situation. My dad has a younger former coworker. He added me on Facebook a while back, but I realized he isn't actually friends with my dad on there. He occasionally likes my stories, too. Is it weird that he’s connected with me on social media and engages with my posts, but hasn't added my dad?"
Is it weird my dad’s ex-coworker added me on Facebook but not him?
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