4. Jose had three children, Alex, Ben, and Carlos with his wife, Maria. Jose had no other children. Alex has two children, David and Edgar. Ben has one child, Frank, and Carlos has three children, George, Hector and Isaac. In his will, Jose specifies his estate is to be distributed to his children, per stirpes.

a. If Jose is survived by Alex, Ben, and Carlos, how much is each child entitled to?

b. If Alex dies before Jose, who will be entitled to part of Joses estate, and in what amounts?