They all know each other.
THIS vegetable is delicious; THAT one will kill you.
This teacher is a master; that teacher is a fool.
We love each other, don't we, my spouse?
They (=those two) love each other.
We know each other.
(Note that moeru is optional: Moe smon fìtsap is fine and means the same thing.)
He made his (i.e., someone else's) dinner.
He made his (own) dinner.
They haven't seen each other in eight years.