Any hints and tips to deal with a 3 yr old being mean to his little sister?

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My otherwise lovely DS has become very mean to DD lately - pushing her, deliberately taking her toys etc. I've been dealing with it by telling him that that behaviour is naughty and getting him to apologise to DD and give her a hug. This isn't really working though because he'll happily apologise then do the same thing again 5 minutes later.

Does anyone have any tips on how to deal with this behaviour more effectively? Thanks!

how old is dd? When my dd was being horrible to my ds when he was a baby I read on here that a good tip is to lavish attention on the victim and ignore the aggressor - cuddle your dd saying "oh poor dd, are you ok" cuddle cuddle, and say to your dd "ds has forgotten that we're kind in this family/ ds has forgotten that we never ever push" or similar. Even if you're telling him he's naughty he's succeeding in getting your attention. Try starving him of it in this context (but lavish it on him when he's kind and good) and see how he reacts when she gets all the attention instead. Worked a treat for us. dd was about two and half/three quarters and ds was about 6/9 months.

Good luck, am sure it will pass.