I'm fairly sure Dad wasn't really into films - I don't recall him ever mentioning a favourite - but Mum certainly had a few. Mainly big classic war films such as The Longest Day, Where Eagles Dare and The Cruel Sea. She was also a fan of unashamedly soppy stuff like Brief Encounter, The Wind Cannot Read and Love Story. For context, both M&D were born in the 1930s.
My favourite film for umpteen years is Gregory's Girl, which I think Mum quite liked too.