The accused who was attracted to Jihadism through social media plotted the crime alone, claimed NIA.
The fire ripped through a large events hall in the north-eastern region after fireworks were lit during the celebration, local civil defence said, according to state media.
The incident occurred near the Valsad Railway Station in Gujarat.
According to Mannuthy police, Johnson set ablaze his son Joji (40), daughter-in-law Liji (34) and grandson Tendulkar (12) over a domestic fight.
The blaze, whose cause was under investigation, started at around 1.30 a.m. local time.
The incident took place at 5.25 am in the shop located in Pooja Heights building at Purna Nagar in Chikhli area.
At least 9 pilgrims bound for Rameswaram in Tamil Nadu met with a tragic end on Saturday when a fire broke out inside a stationary train compartment in the small hours of Saturday.
Earlier Chitralekha had staged protests in front of the collectorate for 122 days and the Secretariat for 47 days, alleging that the CPM did not allow her to live.
Several bikes, spare parts and electrical equipment were destroyed in the fire.
Nine units from Cherthala, Alappuzha, Aroor, Mattancherry, Gandhi Nagar, and Vaikom stations were used to douse the inferno.