We love your kids -- seriously, we do. Send us all of the pictures of them. But we want our wedding to be your night off.
If your invitation says "and Guest," then yes. If not, we would prefer it it was just you, not because we don't want you to have someone to talk to but because we have a strict limit as to the number of guests we can accommodate.
Cocktail attire, please.
We don't claim to have a definitive answer to this question, but here is what we know: According to The Knot, "cocktail attire" is "slightly less formal than black tie and black tie optional, which means no tux required for men and no floor-length gown required for women (unless you'd like to wear a long dress)." https://www.theknot.com/content/wedding-guest-attire-cheat-sheet GQ defines Semiformal / Cocktail Attire as the same attire as "Formal" but encourages men to "feel free to take some liberties with your underpinnings. A gingham would be a smart move. Same goes for a pair of sleek loafers instead of lace-ups." The self-referential definition isn't super helpful, so here's a link to the article: https://www.gq.com/story/what-to-wear-to-a-summer-wedding-dress-codes
It really isn't. In Chile, everyone wears a black dress, so don't feel like you have go out and buy something that isn't black.
Yes. If you know the bride (and chances are that you do), you know that one can never be overdressed in her eyes; everyone else is underdressed. Want to wear a tuxedo? Go for it. Have a gown you've wanted to wear but there was never the right occasion to pull it out of your closet? You're welcome.