Hello, I am a U.S Citizen with Mexican heritage, which means most of my family still resides in there, I've recently just turned 21 and I'd like to go visit them in their native city of Chihuahua, I already have my passport ready, but I'd like to know what else will I be asked at the port of entry, I'm not planning to stay at a hotel, but rather with my family members, can I just show immigration their address as proof of accomodations? Do I have to show proof of funds?