a)Until which generation should festivals not be celebrated for one year on the demise of family members? b)Which festivals can be observed? Can Sri Jayanthi, Navaratri, Vijaya Dasami, Sankramanam, and Alwar Acharyan Thirunakshathrams be celebrated? c)Can we perform Ganga Snanam on Naraka Chaturdasi? d)Can we keep Golu during Navaratri time?

a)Close relatives are those within the three generations, and festivals are not celebrated for one year if the demise of a close relative happens. Otherwise, others can participate in celebrations based on their mental state.
b)All the festivals mentioned in the question, such as Sri Jayanti, Ramavami, can be observed.
c)Ganga Snanam can be performed.
d)During Navaratri, Golu can be kept. People generally observe all festivals unless they belong to the 3 generations