The attackers stormed the house in Girjapara of Baghadanga under Damurhuda upazila around midnight while Alam Mondol, head of the family and a cattle trader, was sleeping in the veranda, said Liakat Hossain, officer-in-charge of Damurhuda police station.
The attackers also hurled a crude bomb targeting Alam which left him injured, Prothom Alo newspaper reported.
Hearing the sound of the explosion, locals rushed to spot but by that time, the miscreants exploded three more bombs and escaped. Some reports said that the blasts injured another person also.
Later, the police visited the spot and the injured was admitted to a hospital.
There have been systematic assaults in Bangladesh in recent months, especially targeting minorities, secular bloggers, intellectuals and foreigners.
Last Saturday, a liberal professor at Rajshahi University was hacked to death by Islamic State militants. Two days later, Bangladesh's first gay magazine editor was murdered along with a friend in his flat in Dhaka by Islamists.
Image used for representation purpose only
Bangladesh professor hacked to death near his home
Attack on Hindu temple in Bangladesh injures two
Hindu priest murdered in Bangladesh, ISIS claims responsibility
Gay magazine editor stabbed to death in Bangladesh
Student detained over LGBT rights activists' murders in Bangladesh