I really like the way that clones can have traits that children usually aren't allowed, but sometimes it has funny results. One of my child Sims is a flirty schmoozer and natural cook, and he keeps getting 'Serve A Meal' wishes even though he has no cooking skill.
My main family has three boys who all look like brothers, but one was born to them, one is a child that the father got from the time machine, and one is his grandfather's clone. Weirdly, the son from the time machine looks more like his father than the clone does - the clone got a different hair colour for some reason. I cloned him from a sim with black hair, but he came out with a weird brown-copper colour that I think I created when I was doing a makeover in Twinbrook.