Inheritance

My husband passed away three weeks ago. How soon should his children tend to his will? I have no idea where he drew up his will. According to what I know his two daughters from his late wife were gifted all the properties except one as they were conceived out of wedlock. The other property I was told, I inherit an eighth. Is it not a quarter as his daughters are haraam? Also the said property has debt and so has the properties that he gifted to his children. Does the property I inherit from have to cover the debt of the properties his daughters were gifted and only after those debts are paid do I get my share?