If you want a pure family, you must get mametchi or memetchi or violetchi or kuchipatchi . Then get your family bonding to 100 percent. Then marry mametchi to chantotchi or marry memetchi to mumutchi or marry violetchi to sukatchi or marry kuchipatchi to yunepatchi. Then you will get two eggs. If you check your tamagotchi's family you will find that it is not a blended family anymore. It will be mame family or meme family or kuchipatchi family or violet family. These are pure families.