We also have a grey, called Jazz, along with 3 conures, 2 hahns, a senegal, 2 celestes, 2 love birds, 5 budgies, 4 finches, 4 canaries and 6 quials PHEW!!
Jazz is our baby, we had him at 16 weeks old, and hes know nearly 9 months old. He is so funny. he whistles the adams family, says hello, you alright, what ya doing, Alfie!! - my dog lol, give us a kiss - he learnt this off the hahns, and loads more, i can't think of at the mo.
We have been warned though, that greys don't normally start talking until 12 months, and if they do start early, you can't shut them up!
As for food, i bought a parrot mix where the sun flower was already shelled, it stop them from picking it first, but it was very expensive £22 per 9kg, but my local pet shop, makes a parrot mix for me, without sunflower, its till more expensive than the normal, run of the mill, parrot food, but they are worth it.
Mine all eat fruit, and veg, but do like theirs nice biscuits around 3ish! Naughty i know, but they don't have a lot.
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this is jazz, and my son lewis