Crispin died testate and was survived by Alex and Josine, his children from his first wife; Rene and Ruby, his children from his second wife; and Allan, Bea, and Cheska, his children from his third wife. One important provision in his will reads as follows: "Ang lupa at bahay sa Lungsod ng Maynila ay ililipat at ilalagay sa pangalan nila Alex at Rene hindi bilang pamana ko sa kanila kundi upang pamahalaan at pangalagaan lamang nila at nang ang sinuman sa aking mga anak, sampu ng aking mga apo at kaapuapuhan ko sa habang panahon, ay may tutuluyan kung magnanais na mag-aral sa Maynila o sa kalapit na mga lungsod." Is the provision valid? (4%)