Brother and inappropriate comments

TMI Warning!
For the past month or so my brother has been saying some sick inappropriate things to me (he is 28) some of the things he says are
"She knows im going to touvh her nipples" 
"Im going to cum all over her towel"
"Will you feel and lick my balls"
I feel so uncomfortable when he says these things. It sickens me. My mam and dad find it funny and they tell me im not normal because i dont laugh at these comments. My dad even eggs him on at times. I might talk to my college counsellor about it tomorrow but I honestly just wanted to get it off my chest because it is starting to get me down :(