I'm very curious, and I just wanna hear your thoughts and opinions

(Idk if this may be considered as spoilers, but I just put it here just in case)
So I have few questions about some characters:
1.) We all know that Lee killed a senator for having an affair with his wife, but I wanna know he if he did it on purpose or accidentally?
2.) In Episode 1, My friend told me that if you don't choose between saving Doug and Carley, they both died. Does the story continue on, or do you have to replay that part and save one of them?
3.) I took Clem with me to Crawford(even though Vernon disapproves). What happens if you didn't take her with you?
4.) Is it a better choice to let Kenny kill the boy in the attic rather than me killing him? (Mine says it helped Kenny o.o)
5.) I was checking the wiki about Episode 4 and down at the trivia part it says,
"The photo Molly shows you of her sister may just be a photo she stole from the house you are staying in, meaning Molly may have a plan to steal the boat. (This is hinted at by the fact that we see a smashed picture frame without a picture in it during a cut scene)"
What do you guys think?