I'm not from the US no, and I kind of assumed he'd be with you permanently.

Not every "first" is overwhelming... Just because he's never been in a large crowd doesn't mean he will automatically dislike the experience.

I'm one of those "God is everywhere" types, the only reason I suggested (strongly) that he attend the funeral is because of the finality of death you get from the funeral, its not the same as other options. I've experienced both, so just sharing what I've learned.

You guys will undoubtedly do what yuou think is best, which should be good enough for junior.