You can't eat as well as dumplings, and you can't play as well as your sister-in-law

Brother marries sister-in-law

Manchurian custom

Old Manchuria had a custom that a father died and his son married his concubine's mother, and that an elder brother died and his younger brother married his sister-in-law. As a result, in the early Qing Dynasty, it became common for brothers, uncles and nephews to marry each other's wives and concubines