For a short period of time, don't let the 3 year old child near the other one. What you don't want is that parent leaving on this issue.

When you re-introduce them, take 3yo hands in yours and stroke other child. Say: we use our gentle hands when we touch our friends.

Then let the older child stand up for herself. By saying: I don't like that. Don't hurt me. If they don't say it loud enough, or with enough force, I aske them to say it again, till they feel the power of standing up.

Then watch 3yo like a hawk.

Good luck.

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