we used flight receipts, boarding passes, hotel receipts, several unfiltered photos that was clearly us, covid test results for travel, screenshots of family conversations with my fiance, passport stamps.

can add downloaded chat between you and fiancee, receipt of remittances ( money transfers), pictures of you both, boarding passes, hotel receipts,

we have 2 kids I think this is the best evidence I sent there birthday certificate I sent pictures everything already only the statement where my fiancé declare his ready to get married when his arrive to usa

You have to give them complete picture. What did your rfe letter say?Mine was to prove that marriage was bonafide. You need to send them as many evidence as you have and think of.If you have sent money to each other. passport stamps. If you have joint bank account in either countries. Also messenger or what's app records, Facebook posts

if 2 fiancé have kids I think this is best evidence ever someone can prove to uscis

True if you have more evidence that's better. If you got a rfe, they need more. Are you the petitioner?

yes I’m the petitioner