Our family-based petition recently got approved. We're currently waiting for the immigration packet from the National Visa Center. Our petitioner is my husband's parents making my husband the principal petitionee. I have 3 legitimate children from my husband and one illegitimate child from another relationship. My question is, can we include my illegitimate child on our application? Or do I have to wait to get to the US and file a separate petition for my son? I am hoping that we can all file our papers at the same time since my son is only 2. Thank you!