I don’t have kids but (if) once I will, I’m going to do the same what you’ve done. Just to give them guidance and an essential knowledge of films. I also think it’s an important part of cultural heritage. They shouldn’t just watch Marvel and DC all the time when there’s so much more beyond that they could possibly adore even more.
I can imagine how happy you were when your younger one watched and loved Alien. I’d be proud like hell for sure. 😄