I don't see how claiming child tax credit can affect a DACA app. I haven't come across someone not getting approved for rightfully claiming child tax credit. You are able to claim nices, nephews, your own parents as dependents, but if you get audited,you have to prove it to the IRS.Maybe the person who did it is aware that he/she falsely claimed his/her nices and nephews as dependents when they weren't, and this person is afraid of potential consequences...dunno...I like to make stories in my head lolz
Trust me, you don't want to mess with the IRS