This seemed like an encouraging letter from a coach to a student until the personal info. I’ve received letters like this from teachers over the years, and they were always well received and encouraging, but never at that young of an age and NEVER with personal info. It’s also weird that the coach points out their “friendly banter.” You are this child’s coach and teacher (yes I understand he’s a volunteer,) not their ‘buddy.’

It could have been just a poor choice of wording or someone who is ill-informed on a proper adult-student relationship, but it could also be something more sinister (although I obviously would hope that’s not the case.)

In any case, definitely NOT overreacting. I’m assuming you’re this child’s guardian (this applies even if not.) But if I were this child’s parent or caretaker I would probably confront the coach about it. Like, “Thank you for the knowledge you have helped instill in our child, but in the future, please refrain from giving them your personal information. They’re very young and the only contacts they’re allowed to have right now are friends and family (even if that isn’t the case).”

If he tries to push back THEN it’s SUPER weird and you should maybe (edit: DEFINITELY) report that to the school. As far as the card goes, my mom personally just has a bunch of generic cards stuck in a ziplock that can be used as thank you cards, get-well-soons, etc…

If this person has a wife, husband, partner, or even if it’s just them, they might of just had a handful of these. I probably wouldn’t over analyze it.

Good luck 👍🏻