A young boy and an adult man looking at ducks in a pond.
The boy and his dad walk along the edge of the pond.
The adult man might not be the dad of the boy. Just because they walk along the edge of a pond doesn't mean they are looking at ducks.
Just because a boy is with an adult man it does not mean the man is his dad.  Just because the boy and man are looking at ducks in a pond it does not mean they walk along the edge of the pond.
The boy and man are not necessarily a boy and his dad.