I don’t think you’re out of order OP.
Maybe the young lad doesn’t know how to wash under his arms with shower gel /soap.
I had two GDs staying last summer and one of them absolutely stank - turns it she was just standing in the shower and not washing herself under her arms at all.
I “popped” into the bathroom when she was there with a towel for her and reminded her to use shower gel under her arms.
Lads need to know how to do this too.
The armpit should be dry before antiperspirant is applied.
If the smell is really bad, you might suggest shaving his pits to his parents and using hand sanitizer as a last resort.
He also might have an allergy to dairy products. If he drinks a lot of milk, it might be time to wean him off it.
Japanese people consume no dairy at all and are well known for having no body odour at all.
They also have a shower and bath everyday.
It’s good manners not to be stinky. Your grandson needs to know that he has to make it in the real world with people who don’t necessarily think he’s cute. Not being smelly is part of socialisation.
You might emphasise that with him.
I’d not mention it to his parents anymore… just show him directly how to wash his pits and bits when he’s staying with you.
He’ll thank you later.
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