In a statement Adnan and Arsalaan Habib's family described the brothers as their "family's precious jewels, spreading joy wherever they went".
The statement added: "They were happy and joyous boys who were a central part of the family, always smiling and bringing smiles to everyone they met."
More top news
Cloudy, wet Sunday afternoon. Turning windier overnight into Monday with a second band of rain affecting us on Bank Holiday Monday morning
A 52 year-old man has died after being struck by a car in Salford. The car failed to stop at the scene but was later found on Dalton Drive.
Cumbria Police are investigating the suspicious death of a 35 year old man in Barrow in Furness.