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No rattie, Свой, is reflexive pronoun like 'savo' in Lithuanian if it helps anybody.

Eg. is correct

But он бьет моего брата. Because it is not 'his brother' but 'my brother'

Does this help?

Эй Шикарно! :P

I believ but, maybe and very possible I am wrong, but in my head sounds much better Svoego?
Yes?

Я часто бью своего младшего брата, потому-что он не даст мне сдачи

своего