Tell your brother not to worry about his writing. He has a nice tone and I found to it to be quite engaging copy. The one thing I would say regarding the site is take the feedcount off for now. You don't really need it until you have at least 300 subscribers, otherwise it looks like your site is dead.
The great thing about a Blog is that the writing doesn't have to be proper English. It is OK to use slang. Although i do think that its a little strong of a paragraph, meaning that if someone finds it offensive in nature then your creditability will go down and your loose the interest of your reader. I may also mention if you plan on using Adsense or some other means of making the site profitable then you might want to tone it down a bit. Most advertisement have strict guidelines as to the content of you site.