Dads are good for

Play fighting
Play sleeping
Play snoring

Real fighting
Real sleeping
Real snoring

Dinosaur Forest explorations
Dinosaur bones excavations
Dinosaur toys allocations

Not noticing mud on pants
Not seeing jam on cheeks

Noticing frog's spawn in ponds
Seeing tadpoles as a perfectly acceptable (and cheap) kind of low maintenance pets

Dads are good for
Big noise
Big portions
Big jumps
Big mess
Big throws

But also
Big unhappy voice
Big bushy reproachful eyebrows
Big pointing accusing index fingers

But most of all Dads are useless for comfort

There is nothing as soft as a Mummy's shoulder to cry on.

Fact.