Let's see if I got this right....
Son @ 19 years is a wanna-be-Wolverine
Room mate, 20 doing wanna-be-Wolverine's momma
Momma is doing wanna-be-Wolverine's best bud.
wanna-be-Wolverine finds out and in a fit of righteous indignation/jealousy(?) stabs them both using wanna-be-Wolverine extra-long finger nails.
Oh humans, they never fail to amuse.