me and my husband got married in July 2011. I got my green card in march 2012. Everything was great, i went to see my family for a month. And at the end of the year he told me he cheated on me with his ex-girlfriend when i was away and she's having his baby. I was devastated but forgave him. But now we don't know what to do. We're going to file joined tax return. Do we have to claim the baby on our tax return, will it cause problems in the future when we have to file for I-751. Will they get suspicious of my husband having a kid outside the marriage( we dont have kids yet). What is the right thing to do?