That word is familiar to me.
(could merely state you're familiar with the word, in the sense that you've heard it before)
You have six children, but I only know five of them.
He answered that he doesn't know him
Contribution from the li'fyaolo' One night, while a young man named Ìstaw had the watch at the border of his country, he suddenly heard a strange unexpected noise in the forest. He knew that there was no viperwolf pack nearby. But as a matter of fact he was familiar with every animal cry of the forest; therefore he knew that this cry had come from a Prolemuris. He decided to carefully step to the source of the sound.
In the meantime, brothers and sisters, please follow the new guidelines and rules. Stay home as often as possible. Wash your hands many (times a day). Keep back a bit from other people. And if you know older folks, whether in your family or as friends, contact them to find out if they're well.
They all know each other.
We know each other.
(Note that moeru is optional: Moe smon fìtsap is fine and means the same thing.)
He is familiar to me.
(I know him)
Do you know my friends Entu and Kamun?