My name isXXXXX have been a licensed attorney for over ten years and will be assisting you today.
If your brother won't act to open the estate, you can do so without the will. If the will still exists and your brother has it, the court will make him submit it to be probated. If it appears that he will not act as the executor and discharge those duties, the court can appoint you to do it instead.
As far as finding the lawyer, that would be impossible without the documents that would likely have his name and contact information on them, as there is no central collection of information regarding attorneys and wills and powers of attorney they drafted. But, you don't need it right now to open the estate. As an heir
, you can do that on your own, will or not.
Even if there is no will, you would be entitled to half of your father's estate under state rules.
If you have more questions please feel free to ask. I'll be happy to answer them. If you do not, please do remember to rate my service in assistance to you today.