Being kind to your siblings when your friends aren’t around is a quiet kind of character.

Family gets the version of you that nobody is grading. There is no audience at home, no reward for being generous to a brother or sister, and no cost to being short with them. That is precisely what makes it a measurement: kindness with no return attached is the only kind that tells you something.

Do one unprompted thing for a sibling this week with no witnesses and no mention of it afterwards: the lift, the chore that was theirs, ten minutes of actually listening. Keep it small enough that you will repeat it. The ones at home notice far more than they say.