So you can select your partner's appearance and through them your child's appearance. I will be curious to see if I put in characters that look like myself and my partner if the baby will look anything like my actual son... lol. I am putting in my bet now that the child plays a role in the game, either they are an advlt because they emerged a bit earlier then you (from however you were frozen) or they are dead and their legacy plays a role in the post-apocalyptic world. It would be a bit weird if you can put effort into creating two characters that have an impact on the appearance of a third yet only one out of the 3 appears beyond the opening.
Also do you get to pick your partner's name or the name of your child or just your name?