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
Some rain overnight. Dry and sunny Tuesday. Colder outlook. Kerrie has the detail....
Serial paedophile Barry Bennell was branded "the devil incarnate" by a judge who sentenced him to 31 years for abusing 12 young footballers.
The man was left with a permanent brain injury after he was given double the intended dose of radiotherapy as a teenager over 20 years ago.