Jonathan Glover and Charlie Land receive custodial sentences following disorder in Epping.
The sisters describe their shock when they were told their mum had died of the preventable illness.
Phillip Curson is given a 27-month prison sentence at Chelmsford Crown Court.
People living in the west Essex town describe the division which is now felt by some locals.
Rhoda Freedman died after arriving at hospital confused, agitated and dehydrated, the inquest hears.
Rhoda Freedman arrived to the hospital confused, agitated and clinically dehydrated.
Ellis Heather, also known as Rack5, must serve a minimum of 28 years in prison.
The restrictions affect parts of Hertfordshire, Bedfordshire, Berkshire, Buckinghamshire, Essex, Surrey and London.
Flames spread "out of control quickly" in dryer conditions, the Essex fire service says.
