SOLVED. Childrens Fantasy. Family who gets powers when they turn a certain age. But 2 boys in the family get horrible gifts, so they look and see why they got bad powers. Spoilers. [s]

[Jimn]

Spoilers ahead
So, its about 2 families that get powers when they reach a certain age, but 2 boys in the family get horrible powers, one of them (the mc) who wanted the power of super strength gets the power to light matches on polyester or some other type of material, and the other who wanted the power of super speed gets the power of his belly button to be pushed in or out at will.
So the 2 boys go out and try to find out what caused it and while doing so they find a daughter of the family's nemesis or something it turns out that she also got a horrible power and they form a unlikely truce to find out what caused them to get horrible powers.
They find a person who was stealing all the good powers with a machine because he got a bad power when he was a kid. He was also going to get a good power while taking away everyone elses.
So they defeat him gaining their powers back but they have to do something that takes away their powers again and the books ends from what I remember.
I read this around 2009-2013
Thanks

[Becca]

Almost Super by Marion Jensen

[Jimn]

That was it thanks!