It was only when one of my kids got a GCSE in French that I realised I knew more French than him, I say that because I didn't like it at school. There seems to be a consensus "it's the way we were taught". After my father's death one of my French cousins sent me some correspondence my father had with their parents and told me "you know your father spoke perfect French", I knew he spoke some, and I felt quite annoyed that he didn't help me, particularly as he thought everyone should try and speak another language other than their own. Anyway I've gone back to it now and there are times when I've mentally stuck two fingers up to him whilst I'm in the throes of learning
My husband went to grammar school and did Latin as well as French, he was very good at the former, I remember being of the opinion that learning a dead language was a waste of time, but he's definitely persuaded me otherwise, Latin is a help with all the Romantic languages, he's doing Spanish and is always commenting on such and such a word, derived from Latin.