It depends on the context and the creator's intention. Sometimes a series called 'Family' can be fictional, but it could also have elements based on real-life experiences.
It can be seen as funny in a dark and satirical way. The unconventional plot and quirky characters often bring out elements of humor that are not your typical kind.
In general, the witches in Macbeth are not intended to be comic. They play a crucial role in setting the dark and foreboding tone of the play, influencing the fate of the characters in a more ominous way.
Usually, for formal writing, the title of a novel like 'Frankenstein' is italicized rather than underlined. But in some less formal or specific contexts, underlining could be acceptable.
The length of a novel really depends. Traditional novels often fall in the range of 60,000 to 100,000 words. But there are no strict rules. Some genres, like young adult fiction, might be shorter, and epic fantasy novels can be much longer.