The Pitru Gayatri Mantra can be used to appease the dead. It is exceedingly auspicious to recite this mantra in Sharad Paksh.
It is a very strong mantra, and anyone with Pitra Dosha in their kundali should perform this mantra puja.
If Pitra Dosha is present in the horoscope, it escapes through chanting.
If a person is childless, they must perform this pooja in order to receive blessings for the future.