to get the main character for pure family (such as mametchi, memetchi, kuchipatchi, or violetchi). u must do the right training for them & increase your bonding as needed.
to get mametchi => have a high bonding (80-100%), & always use the first training icon.
to get violetchi => have a medium bonding (40-70%), & always use the first training icon.
to get memetchi => have a high bonding (80-100%), & always use the second training icon.
to get kuchipatchi => have a high bonding (80-100%), & always use the third training icon.
all of these must be done before u reach the adult stage, if u already get the adult u didn't want, then u can only change them to neglect character or try again for the next generation...!!!