In fact, most of this trailer plays for humor, as two brothers go on a quest to bring back their dad in order to spend one day with him, thanks to a magical spell.
The spell goes a bit awry and they are only able to bring half their dad back – as in literally the lower half of their father.
Dead parents are a pretty common trope in animated movies, but this one is less of a sad portion of a storyline and more about wish fulfillment.