Question: Many pray for their ancestors to bless them. Does this work?
Answer: They are not able to bless us, unless they have been reborn with greater blessings, or have become Bodhisattvas and Buddhas, and are looking after us. Also, merely asking ordinary beings to bless the survivors does not mean they will or are able to do so.
That said, whether the deceased and/or reborn are aware or not of the below or not, survivors’ expressing gratitude, sharing of guidance (to reach Amitabha Buddha’s Pure Land), support-chanting and merits, with making of offerings to them does create some merits, that thus create some blessings for the survivors.