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I think the punishment was spot on.
I would suggest enrolling them in some sort of activity together. Like dance or swimming lessons, sports, arts and craft classes you can attend for cheap via your local rec books.
They need to do things together to help them bond. The more constructive the activity is the easier it will be for them to get used to spending time together without butting heads and it'll help them see that more than just you will not tolerate unsportsmanlike conduct from anyone on a "team" of sorts.
Best of luck.
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