However,days do not determine what happens to you , either Good or Bad.
During the ritual of Shraddha the Vishvedevs called Pururav-Ardrav and Dhurilochan are also invoked. Vishvedev means the ‘group of Deities which represents the Deities during a sacrificial fire’.
Pitrus, Ancestoes present during Mahalaya Sraddha.
He informed me that , as an Iyengar belonging to Thengalai Sampradya, he does not do it as it is prohibited by Ramanucharya.
He told me that the other sect of Iyengars in Tamil Nadu, Vadagalai Iyengars perform the Pitru Paksha Tharpana.
As I am unable to find any authentic source on this, I am posting my views.
Those who know the subject well may quote with source.
In Hinduism there are two paths in terms of Lifestyle.
One is called Pravritti Marga and another Nivrutti Marga.
Pravrutti Marga is the leading of our daily lives , as normally do, by going after the sense objects.
Nivrutti Marga is renunciation of the sense objects.
When somebody tells me that they are going through a rough patch due to circumstance beyond their control, I tell them first to be sure that they are performing Sraddha for their ancestors regularly and whether they are following the Sumngali Prarathana done in their Homes.
As for as I know these are the prima facie reasons fo misfortune before we try doing any parihara
I have some articles on the subject.
Such is the seriousness of Pitrudosha that it can nullify the effects of Poojas and Punyapalas.
As an aside, Matru Dosha is not being talked about as much.
Pirtu generally means ancestors, which includes women as well.
But there is difference in performing Sraddha between for Men and Women.
Mahalaya Paksha is called the Pitru Paksha where the ancestors are remembered and offered the Tharpana.
One of legends for the Pitru Paksha is as follows.
After Karna was slain in the Mahabharata War, he ascended to heavens, Swarga.
There he was offered god and Silver every day but never Food.
He asked Indra, the chief of Devas for the reason.
Indra informed him that though Karna had given away whatever he had to those who had asked him, he never donated Food.
And if Karna were to get food in Swarga, he has to donate Food.