F had three (3) legitimate children: A, B, and C. B has one (1) legitimate child X. C has two (2) legitimate children: Y and Z. F and A rode together in a car and perished together at the same time in a vehicular accident, F and A died, each of them leaving substantial estates in intestacy. (2008, 1998 BAR)

(a) Who are the intestate heirs of F? What are their respective fractional shares?
(b) Who are the intestate heirs of A? What are their respective fractional shares?
(c) If B and C both predeceased F, who are F’s intestate heirs? What are their respective fractional shares? Do they inherit in their own right or by representation? Explain your answer.
(d) If B and C both repudiated their shares in the estate of F who are F's intestate heirs? What are their respective fractional shares? Do they inherit in their own right or by representation? Explain your answer.