:help:My in laws both expired.My father in law expired after my marriage.My MIL expired at my DH early age.Now nobody knows her pithupooja thithi.So i do pooja for my FIL on his thithi. but for my MIL on puratasi amavasya.This year i did for my FIL correctly. But for my MIL i was unable to do on puratasi amavasya due to some important reasons.so i fixed today (thai amavasya).but from past 2 days i m unwell due to my back pain.hence i m unable to do pithru pooja today.i feel guilty for my MIL.I was doing all the year correctly.This year alone i m unable to perform pithru pooja for MIL.I m from naidu.According to our tradition we perform pooja by providing rice,valakai,vendakai coconut gravy,rasam,curd,parupu,vada,payasam,then we lit lamp.keep to crow.everything very nevanishty,with bakthi.but now i unable to do. i lost adi amavasya,thai amavasya,puratasi amavasya.Please guide me to satisfy my MIL.i can get peace by performing her pooja alone.From the morning till now i m unable to eat.Please help me.