How old is your little brother?Your not a very good role model if you are letting him play T-M rated games.
Better solution, Replace the files with a blank vtf.That's what i did when i put hl2 on my lil' bro's computer. Same way as in gmod skin replacing.
I show my 7 year old brother the TF2 meet the's.Other then meet the spy, which I censored.
