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."
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Nadeem Muhammad has been jailed for 18 years after a pipe bomb was found in his hand luggage at Manchester Airport.
Nadeem Muhammad, 43, was convicted of possessing an explosive with intent to endanger life after a pipe bomb was found in his hand luggage.
Sun and showers, also feeling fresher for the next few days