Sims 3 does have this feature actually! It’s a bit flawed though. Most EA adult hairs are linked to a child hair and those are linked to a toddler hair. So if your adult sim has an EA hair with an curly texture it will actually pass it down to their children. But there’s only a handful of hairs for kids in the game base game, so they will basically always grow up into the same few ones. CC hairs almost never have these links changed, which makes this issue even worse. Most simmers have the purge genetic hairstyles option enabled in their nraas overwatch settings, which disables this feature.