1) once deed of partition has been made it would be self acquired property of your grand father .
2) your grand father can sell , gift , transfer property to whom soever he pleases
3) he can also bequeath property to any of his sons if he so desires
4) your father or you cannot claim any share in said property as on date
5) only if grand father dies intestate and your grand mother predeceases him would your father have 1/4th share in property .