Erasing a Google result ?

[OceanBlue]

When I Googled my son's name and high school the search engine not only pulled up his honor roll and football activity it pulled up a twitter conversation where someone used the term "nigga" and "bitches"
My son didn't use the language but was part of the conversation yet it shows when his name is googled.
Any way to get this erased ? He is up for several scholarships and this looks bad.