A grudge in a shared bedroom is like a third roommate who never pays rent.

Resentment in a small space takes up room without contributing anything. In a shared bedroom there is nowhere to put it, so it sits in the silences and in who turns the light off. Both of you end up working around a presence neither of you wants there. It costs you both and feeds only itself.

In a standoff with a sibling, you can end it without a conversation about who was right. Say one ordinary sentence tonight, about dinner or homework or nothing. Being first does not mean you were wrong.