Blazing Bazookas In Burma (Bijli Adventures #1) by Dev Malory [Paperback]

Arjun Malik has been trying to get into his grandfather's attic for years. All it takes is one bent hairpin.
Inside, under a dusty tarpaulin, lies Bijli—a decommissioned WWII bazooka, painted olive green, with a small lightning bolt scratched near the trigger housing. With a resident ghost.
The ghost is Sergeant Reginald Alistair Fothergill, British Army, Burma, 1944. He has been waiting eighty-two years for someone to open that tarpaulin. He has opinions about cricket and the Internet. He will not be discussing the mango tree incident.
What follows involves a six-hour foxhole, three very opinionated chickens, the most memorable history lesson Class 6B has ever had, and the long, patient business of returning a soldier to his family.
Blazing Bazookas in Burma is the first book in the Bijli Adventures, a Chhota Fauji series about the things families carry, and why they don't put them down.