Malcom and Sarah Harding
How did Malcom meet Sarah Harding? Was it covered in any of the books? I wouldn't otherwise ask but for the simple fact that Sarah's "father" was in the first movie makes me wonder. Neither the second not third movie make any sense whatsoever but since characters sort of cross over, I say some things need to make sense.
For example, Malcom tells Grant he has three kids in this movie then all of a sudden one of his kids is the token black character in the second movie and he's dating the daughter of a character whom he has no interaction with in this one.
Then, after years of being very close partners (who knows how long really), Grant is no longer with Ellie in the third one and she has a two year old son.