How to rewrite queries using sub query structure

[luxmraj]

How to re-write this self-join queries by
using the sub-query Structure (without using the CONNECT BY
clause)?

SELECT f1.child as parent, f2.child
FROM FamilyTree f1, FamilyTree f2
WHERE f1.child = f2.parent

SELECT f1.child as grandparent, f3.child as grandchild
FROM FamilyTree f1, FamilyTree f2, FamilyTree f3
WHERE f1.child = f2.parent AND
f2.child = f3.parent

thanks