A family member of the two women and three children who died in the blaze said he had only just seen the two boys at the weekend and that they were "happy, energetic boys."
Cousin Ishfaq Hussain Kayani spoke to Dom Reynolds at Channel 5 after a grandmother, aunt, two children and a nine-week-old baby died at Wake Road in the Sharrow area of the city.
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Metal girders fell down and the roof collapsed onto worshippers during a service, witnesses said.
The tanker slammed into other vehicles and burst into flames on a major road leading from the capital Nairobi.