if the transfer is to be done by book, each of the estates of the dead persons has to be settled, with estate taxes and penalties, if applicable, paid. I concur with admiral that the best way to do this will be to execute extrajudicial settlement of the estates of the deceased persons.
the end result should be the title will be in the names of the 3 surviving children, and the surviving grandchildren whose parents died. if the grandchildren are minors, their share can be registered and held in trust by their guardian until they reach 18.
i do not know what kind of administrator you are referring to. if you filed a petition in court to settle these estates, an administrator of the property will appointed and he has authority to sell the property.
in the extra-judicial settlement, the heirs may also name a trustee in whose name the property will be registered.
the heirs may also execute a Special Power of Attorney to sell the property for them.
there should be no donor's taxes to appoint an administrator. be careful, if you donate the property, the donee becomes the absolute owner of the property.