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Pitra paksh is also called as "Shraadh श्राद्ध means shradha श्रद्धा (homage, obeisance).
So there is no matter of guilt or fear whatever is preached in the society.
You can always pay homage to your beloved mother soul.
During pitra paksh you can pay homage to any known unknown souls whose demise date is unkown on the last day of "Amavasya" "New moon."