Unjust & unfair transfer of title to the heirs.

Here's a refined version of your statement: "The original owners of the estate were our deceased grandparents. Initially, there was a single-parent land title with an extrajudicial agreement among heirs regarding the subdivision of lots. However, the Local Government Unit (LGU) purchased four parcels of land and transferred the title of all lots to only four heirs who sold their portions, without consulting or considering the other three heirs. The LGU facilitated this transfer of title. As siblings of one of the heirs who did not sell our lot, what are the best steps we can take to address this injustice?"