The belief of a snake twin is very old, way back 17th century, when Fray Ignacio Francisco Alzina's 1668 "History of the Bisayan Islands" mentioned about it. Remember Amaya - the main character in GMA Channel 7's TV series entitled Amaya? The idea of snake twin of
Amayacame from him.
While for Chinese, snake is a good-luck charm for businesses, that's the reason why some of them keep snakes in their house, more especially in bodega. Well, animals should be fed. (You'll know what I mean.)