Inheritance dilemma

== SCENARIO ==
THE PARENTS:
Grandmother (died 1984) - She stated on her Last Will and Testament that her properties will be turned over to her 10th child right after her death. And by the time that her 10th child dies, the said properties will "go back to where they were originated".
Grandfather (died 1945)

THE CHILDREN (all 10 of them had received their OWN inheritance even before their mother died):
Child#1 - died 1970
Child#2 - died 1985
Child#3 - died 1986
Child#4 - still alive as of 2011 - Agreed to sell the properties
Child#5 - died 2000
Child#6 - died 2001
Child#7 - still alive as of 2011 - Agreed to sell the properties
Child#8 - died 2008
Child#9 - died 2008
Child#10 - died 2011 (The dilemma starts here; she got no husband nor children)

Child of Child#1 (grandchild) - Wants to sell the properties.
Child of Child#3 (grandchild) - Also wants to sell the properties.

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I am an illegitimate child of Child#8; my birth certificate bears my father's ( Child#8 ) signature.

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From this scenario, who are eligible to receive amount once the properties are sold?

Thanks so much in advance for your answers.