*when both of you probate the will, you both entitled the share has mentioned in the will. But there is no entry in the will about your divided share, both of you right to divided in 1/2 share.
**Debt: If any debt has been mentioned or not in that will both of you liable to pay the debts as mentioned the basis of the share.
***but in this problem, at an point of time, your father did not concentrate your grandma's business. Your uncle only maintain that business. In the mean time there are most of possibilies to do any of misfunction in your grandma's business by your uncle. So, your father need not laiable for the middle of the time raised debts created by your uncle.
****The time and the cost for your case are not be speified. becuase it depends the court and the lawyers