Sounds like my family. Only they treat my brother that way because he's the only male. My "label" of AS hasn't made them treat me differently. It has made my mom (who is def NOT an Aspie) respect me a tad more.
My dad almost certainly is the source as well. He is very stereotypical. He doesn't like many people, and would prefer to geek out with his anime or J-Pop or fishing obsession than hang out with them My dad and I are A LOT a like so when I met my now-husband and he explained to me what AS was I had the same reaction, "That's not normal?" Over the years my hubby became more convinced I also had AS, but I didn't fel the need to get Dx because I was happy and a Dx wasn't going to really make a diff. But then we had our son and I have been DROWNING due to my terrible multi-tasking ability and practically nil organizational skills. Not to mention the constant attachment that comes with kids (although I totally LOVE my son, the never getting time to myself is thrashing me by the end of the day). So I decided to go to a neuropsych. I was Dx pretty easily: I have many of the major signs and I have what seems to be a family connection (although my dad isn't Dx).
I wanted to find out 100% why I am the way I am, good and bad, so I could hopefully be a better mom and just generally a more functional person. And It seems to have helped a bit (although it will take much more time for me to learn about it. it's only been a couple weeks). I would get Dx for THAT reason, I wouldn't expect it to change how others treated me, at least not in a good way. My mom's 1st reaction was, "You're just lazy. You did fine in school. There's nothing wrong with you besides laziness". Then once she read up on it she was like, "OH, so THAT'S why you have always been that way". So it was a bit vindicating, but at the end of the day it didn't change much. they still coddle my bro and let him get away with all kinds of crazy stuff.
So basically, I would only get Dx if it's going to help you be a better person or have a better life. I know some here may think you seem a tad "complainy" but I too understand how it is for a sibling to get special treatment (although mine doesn't seem to have a disorder or anything) and it is incredibly insulting and painful. You pretty much just have to get over it. Just be glad it's because maybe your bro really DOES need help. And learn to say no to your family. You don't HAVE to take on everyone else's problems because you've been a survior and taken care of yourself. My hubby gets the same treatment from HIS family. They are all very irresponsible people except for him. So because he makes OK money they act like he is rich (not at all).eventually he had to just say no unless it was an emergency. I always try to remember the saying that you can't change others- only yourself. You can't control how others act only yourself.
So, if a Dx would make you feel like it would help you understand your way of thinking and that in turn would help you out- then I would get Dx
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"Read a f#@^ing book" - Nucky Thompson, "Boardwalk Empire"
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"We have neither of us anything to tell; you, because you do not communicate, and I, because I conceal nothing." - Marianne, "Sense and Sensibility&