Americans born to Mexican parents (who are also American).

My wife is from China so we'll be visiting her hometown for the first time since getting her green card!

We'll be taking my younger siblings with me.

- My parents and I were born in Mexico. We're all naturalized US citizens.

- I already know to indicate my dual nationality on the application.

Question 1: Should I include information about my wildly out of date, expired Mexican passport? I held it over 15 years when I was around 8. I was originally planning to omit it, or national ID with the following explanation: "I haven't had a valid Mexican passport in over 15 years, and I've never lived in Mexico [this is true], so I don't have a national ID"

As the title mentions, my siblings are American, born in the US. At the time, our mother was only a green card holder, and our dad was already American.

- As I understand, based on the Mexican constitution, even they are considered dual nationals by Mexico.

- They've *never* held valid Mexican passports

Question 2: Should we indicate them as dual nationals as well? The explanation will be even more straightforward than mine, since they've never had Mexican passports at all.

Thanks in advance!

TLDR
1. Should dual US/Mexican national omit 15 year expired passport with explanation, or include it?
2. Should American born Mexicans mention dual nationality?