Living in Scotland would not preclude you from suing in this country's courts as long as you have a valid reason to sue. The fact that everything was given to one brother to the exclusion of the other is not in and of itself grounds to open up a will contest even if your father simply didn't like Scotland or Scots or children of his that lived there. (Now there might be an exception if you lived in Ireland instead....naaahh)
Your fathers brother is your uncle.
Your father's brother is your uncle.
If your father was of sound mind when he made his will he can leave his property to anyone he chooses. You can contest the will if there are technical errors or if you think there was undue influence. However, you should be prepared to support your claim with some evidence. You can read more about it at the link below.
uncle
uncle
Your entitlement will depend on the will. Or the laws of intestacy if there is none.
Your Step-brother. If he isn't your brother but he is your father's son, he's you.
father's younger brother is called chacha
cousin
aunt
uncle.
She can, but like it will be dismissed.