How to get a copy of a Will?

Question Details:

My mother died. She had a Will but the attorney that drafted it has the only known copy. One son has the original but won't show it or file it for probate. He lives in the mother's house for free so he is not not interested in having anything changed. There are 2 other sons and 1 daughter in family. Contacted attorney that has copy (which they confirm) but will not contact us back about our paying for and getting a copy. Need it to file for probate or hiring an attorney to handle. How can we get a copy of the Will from the attorney? We can't make the son come up with original. Important Notice