About a Boy isn't strictly a Christmas movie, but it does have festive vibes, and the protagonist Will (Hugh Grant) lives off of his father's Christmas song royalties. Will starts out as a meandering bachelor without much ambition until he finds himself striking up a friendship with a young boy named Marcus (Nicholas Hoult) and his mother (Toni Collette). The friendship between Will and Marcus is definitely reminiscent of Daniel (Liam Neeson) and his stepson, Sam (Thomas Brodie-Sangster), in Love Actually, albeit About a Boy is a bit more cheeky.
Watch About a Boy on Netflix.