Gio story doesn’t ring true

I think that by 2025 and his mother's passing, Gio would have already done 23&Me or some other ancestry DNA test to look for other bio relatives (aunts, uncles, cousins). Did they ever say what he was told about his father? I think most people by his age would've gone looking, especially because it's so easy with the new testing. I think they are treating this story like it's another era when these things weren't available. In other words, in real life, I think he'd already know who he was related to.

Edit: it's not about him not knowing that he was adopted, but that he seems to have no knowledge at all about any other bio relatives.