For Will Ferrell, being funny is just par for the course. So, his wife Viveca Paulin and their sons Magnus, 22, Mattias, 19 and Axel, 16, have learned to tee up for his jokes. “Children are overrated. I’m annoyed by them. I don’t even know why we had kids,” Ferrell teased on the July 7 episode of All the Smoke. “They…