Do you pay close attention to the informants listed on death certificates and other records that include this information? Many times the informant is a relative whose relationship is clearly know. Other times it may be a neighbor, long time friend, or someone else.
If your relative died in a place "all alone," take a close look at the name of the informant if you have not already done so. Research that person. They may be someone totally unconnected to your family.
Or there could be a connection of which you are not yet aware.