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
Two boys from Oldham have been sentenced after an horrific attack which left a teenager with brain damage.
A video showing the moment a carriage on the Smiler rollercoaster at Alton Towers crashed into an empty car has been shown in court.
A mixed week ahead