Aedon/Chelidon: Polytechnos lost a bet to his wife Aedon and the loser was supposed to present a slave to the winner. This guy out of rage and humiliation caught hold of his wife's sister, raped her , disguised her by cutting her hair and clothing her in cheap attire and presented her before her sister as slave.She unwillingly and unknowingly served as slave to her sister Aedon till Aedon figured it out when she was lamenting. What they did in return to take revenge on the husband Polytechnos, I would tell you in another story tommorrow. :)Vinata/Kadruva: These sisters were married to same man Kasyapa. One day they saw a white divine horse Ucchaishrava during dusk and Vinata claimed that the tail of horse was white while Kadru refuted it saying it was black. Then they entered into bet where the loser was supposed to serve as slave to the winner.
The desperate and cunning Kadru asked her sons-serpents to spit poison in the horse tail or attach themselves to the tail so that it would appear as blacktail and the snakes did so fearing curse from their momma after initial resistance.
Next day in sunlight when the sisters planned to declare the results, it did appear black and Vinata accepted her defeat and served as slave to her sister till her son Garuda and half-brother of the serpents came and rescued her.
Moral of story: It is always safe to keep the bet prize low,whether it is penny ante or poker game.