Thanks. The creative limits imposed by the family angle are especially conspicuous in the fourth film, where they couldn't get Jamie Lee Curtis back, and had to create a brand new relative for Michael to pursue (Jamie Lloyd), while also relaying through dialogue that Laurie died in an off-screen car crash, which coincidentally is how her and Michael's biological parents are supposed to have died as well.
Then they couldn't get Danielle Harris back to play Jamie Lloyd in Halloween 6, and had to recast the character with a different actress, and make Jamie a mother at age 15 in order to provide Michael with yet another new relative to chase once she was killed off.
That was a real waste too, because if you were going to have recurring protagonists, Jamie Lloyd is one they should've stuck with, considering how good Danielle Harris had been in the role, and what a babe she grew up to be. And from what I gather, the main reason she didn't come back was because of the way her character was bumped off early in the film. Didn't seem like she was reluctant to continue with the franchise otherwise. She certainly wasn't reluctant to do other horror films.