Are online multi-player games unpopular with parents

my mom hates fighting games but like my dad and i we play games like fallout 3 UFC and alot of other fighting/war games. we also play online (he actually stayed on the game one night and i just sat there bored) hahaha well but some parents dont like them games. but like i said my mom hates them. and some games like left 4 dead 2 can teach you how to surrive if there was an zombie attack hahaha some dude told me dat.