I get middle rate DLA for ds2 and get carer's allowance too. I work but can only earn up to £350 approx a month before it gets cut. If you can prove he needs care more than a "normal" child the same age you should get carers allowance too
As Sidge says you do get taxed on it but you also get an extra amount on your tax credits for having a child with disabilities which almost covers the amount you are taxed. (How many times can i use the word TAX in one message!!!!)
Well done, I'm so pleased you got your decision and also that you can now apply for CA. We've been waiting for our DLA decision since July 6th - god it's awful waiting isn't it? so they took 12 weeks for you? I guess we still have some waiting to go.