Dear people writing articles on ways to get siblings to get along, I'll save you the time. The answer is "Don't let them play together"
Please stop Complimenting my kids’ “Good” Behavior goo.gl/fb/rwfojS
Hard pass from me pic.twitter.com/VayvW1eopK
I've gotten to the point where I'd let my kids summon a demon with a Ouija board before I'd let them play Monopoly together again.
Parenthood is when you start counting the minutes to bed time before 11am.