Things being might be real in a specific point in spacetime, but that they are real is independent of time. However what Science "claims to be real"[0] is dependent of time. You can't know that the realness is the final understanding. The closest you can come to believing things are real, is that you can't think of an experiment that falsifies them. But you can't really know for sure, that falsifying is impossible. How do you solve that? I don't have that problem, because I agree with your parent, but this is what I thinks contradicts your understanding of Science.

[0] I personally don't think Science concerns itself whether things are real, only whether the result of model and realness match, but that's what we are discussing here.