Three months? What public school are you attending?
Here in England in the state's schools (at least when I went) the summer holidays were for the month of August and I think July. I can't remember that well. Yes pupils need a break - and the further you go with your exams (like GCSE's and A levels (yes I am using English examples here, so what, I don't know the American education system)) the more time you get off. It's called study leave and you NEED it.
It is also unlikely that you summers hols will be cut down to a week. The schools couldn't get all the new material, class set ups, student applications, transfers etc. done in a week. Teachers need time off as well surprisingly, they're not robots bent on shoving Wuthering Hieghts down your neck (great love story, hate it with a burning fiery passion).
Besides, you do need breaks. (I always found summer holidays to be to long for myself, but that's more for personal reasons that objective ones. In fact it's almost the same reason why I disliked the half-terms (one week off, seemingly at random points throughout the year).) At the young, kiddie ages you have a need for education, but not all of that can be gained from inside the classroom. But that's not the point. Over here, working adults are entitled to four weeks off - for various reasons. Children most likely get more because they're still developing and the daily monotony of their future lives hasn't hit them yet.
Hmm, trying to talk about the innocence of children and the depressing reality of being an office worker isn't working it seems.
Ah well.
Really, you're overreacting. I'm sure you didn't need three months to visit your cousins. Hell, my sister's only spending about two weeks in Jo'burg next month, she doesn't need until late September to be there (she needs that to get all her crap sorted and to do reading before her Law course starts). The education authorities might be extending the school year, by cutting a few days here and there, but your holidays won't disappear completely. They're too valuable for the running of the school (it can also calm you lot down for the teachers when it comes up to Christmas/summer).