Beat the companion's quest line, ask him to be your follower, lead him out of the city, kill him.
Yes you can. If he likes you.
If a character wishes to travel with you on one of the post storyline Companion quests he will stay with you until the quest is complete. The only way to cancel this is to reload a save before the quest was triggered.
Nicolas Farkas's birth name is Miklos Farkas.
Tomas Farkas's birth name is Thomaz Jorge Farkas.
Beast Form fades away in 150 seconds.
Frank Farkas was born in 1956.
Philip Farkas died in 1992.
Péter Farkas was born in 1968.
Mihály Farkas was born in 1904.
Mihály Farkas died in 1965.
Ádám Farkas died in 1786.
Ádám Farkas was born in 1730.