Love Grandpa's gendering confusion

So although to most people I read as female, when I went to Thanksgiving one or my Grandpa's leaned next to me and asked my dad "So you didn't bring the girls this time?"
My dad said "No, we did" and he replied:
"Oh, I see [my mother]'s here." He looked right at me but didn't say anything, just rolled with it. Everyone else was confused since I'm not out to any family, but it was still great.
My other grandpa has been doing that a lot to - calling me a guy - and although it's probably due to his dementia, it still makes me really happy when it happens.
No one else said anything either when I showed up dressed like a guy. :eusa_danc