Blue a gold macaw

Question
I just have a few questions about my familie's 22 year old blue and gold macaw.

firstly are there any bahviour hints to tell the gender?

also the parrot was avery close family pet to my dad beefore i was born. when i came along he hated there being othe kids in the family and has dislike me ever since. but recently he has been less hostile towards me. but i was wondereing if there was any actions i could take to help bonding a friendship.

the other thingwas that he does a lot of exaggerated nodding with the front half of his body at me....wat does this eman

Answer
Only another macaw can know for sure ;)  

Really though, it's very hard to tell by behaviors because macaws are similar in defending their territory, displays of self-protection (extending their wings, fluffing their feathers to look bigger and more imposing), etc.
 The front end bobbing could be another display of power, but it could also be a mating behavior to attract you or attempt to please you.  

When it comes to hating you (or anyone), a bird is absolutely incapable of that. We give them our human characteristics because we don't always understand their own and it's easier.
 What probably happened when you came along is that attention to him from his 'mate' (your mom or dad, or both) diminished.  You may have been viewed as competition, so wanting nothing to do with you and trying to discourage you from sticking around might have been misinterpreted as 'hate', but I promise you, he wasn't thinking that.
 Another very common problem is that children appear to be very confusing creatures with front set eyes (which means they are predators). The bird has learned your parents and trusts that they are not a threat in spite of their predator status, but you (as a child) were all the things that make a bird nervous by pure instinct.
 Children are loud and unpredictable. Their movements, even when innocent, are interpreted as jerky, uneven, spastic.  A nice hand reaching out may suddenly jerk away, while facial expressions go from passive to aggressive or highly confusing (crying, a yell, and so on).  
 
 Now that you're not a child and since the bird is less than half way through his life span (which is about 65 years), there's plenty of time to make a new relationship.

One thing I strongly suggest though is that you have a DNA done to establish whether it's a male or female.  There are a lot of reasons for this, but mostly because one day, if it's a 'she', an egg may become stuck and if you don't know it's even a possibility, by the time you seek help, it could be too late.  This is a common cause of death in female birds, or paralyzation.
  It's not at all expensive either.  You can get a blood sample yourself and send it off to the lab with a total charge of under $30 (the last time I checked).

 Take a look here for lots more about how to interact with this great bird - just scroll down to 'my bird hates me' when you get to the site

  www.4AnimalCare.org  (click on the bird tab)