and i said... >> cooper: roberto actually raised that idea? >> helen beristain: yeah, he did. and i said, "roberto, come on now. you've got your documents. you obey the law. you haven't done anything bad. you... you're not a criminal." >> cooper: are there times when you feel that you made a terrible mistake? >> helen beristain: like they say, "you should read the fine print first before you make a selection." i should have listened closely to those debates. that was a mistake i made. i didn't listen. >> cooper: the beristains' children-- eight-year-old demetri, 14-year-old jasmine, and 16-year-old maria-- have a difficult time understanding what's happened to their father. maria, did you know he wasn't a u.s. citizen? >> maria beristain: no, i didn't know. >> jasmine beristain: he makes this home a home, and he makes a family a family, because he's, you know, the father. and when he's gone, when you take that away from a family, it's like it's all going down. like, for my mom, it's very hard. and for us, it's hard, too. >> cooper: what did you he say to you when you were talki