I'd hold off until you get your parents' data. I'm a little confused about what's going on, but I think they send a SAR that you can make corrections on to everyone. If there are no corrections, you don't have to do anything. If the corrections aren't available yet (parents' data), I don't think you'd want to make corrections now because you'd just have to do it again. So yeah, just hold on to it again later. 🙂 BTW, you can make corrections online, so you don't have to use that form.