Nicole84 - I am sorry for your loss. Brief posts on message boards can often sound insensitive, particularly if we are already feeling emotionally distressed. However, I think the posters are all trying to be helpful. Your father stated his wishes in his will and he also appointed your uncle and aunt as executors - again, his wishes. It sounds like this is a nightmare situation for them now too.
At the risk of also sounding insensitive and/or patronising may I suggest that the best thing you can do at this time is to look after yourself physically and emotionally ? This will involve stepping back a bit, at least for a time. It does sound as if there is a lot of anger as well as grief floating around within the family. High emotions and calm decisions generally do not go well together. If necessary, would you consider counselling or talking with your GP ? It might be money better spent in the short term than on instructing solicitors. Of course you have to keep an eye on your your own and your brother's interests as well, but one can complement the other.