i am from srirangam trichy ,my father expired last year ,we did all the last rights sincerly but unfurtunately we forgot to do the 45th day una masigam

Answer: If any of the Oona masikam not performed, then one should forget about it totally as there is no alternate to this. 27 to30 days but before 1st Masyam, then 41-45 days, then 171-180 days and the Oona Abdeekam before aabdeekam but within 355 days it is to be performed. As a pariharam, during Mahalaya paksha you can do the hiranya srardham to get relief for the sake of your athma thrupti.