LIA
The James household certainly had bipolar people. One moment they were ready to kill each other and the next they were agreeing on a common cause. Is this what siblings did in their families? Anyway, that only made things make more sense.
Them agreeing to not rest till their sister got her revenge was certainly a good idea because Amelia James was never going to rest until she didn't what needed to be done. Ryan would either have a tombstone or he would lose everything.
It would be one of those and they didn't care what the outcome was because, at the end of the day, they would still have won the game anyway. She had family, but her family wasn't whole and it was Ryan's fault.