Aliens ate my neigbors

You are Kuturlak, an alien invader stuck on earth after his transmogripher ran out of batteries, mission HQ has denied your evacuation request and they still expect you to sucessfully infiltrate a human family, on top of that, your tentacles ache. A lot.

But that is not enough to stop you! Use your wits to improvise a clever disguise and sucessfully replace one of the four members of the house, humans cant be that hard to fool, right?