This is from a HRW report:
On May 5, an aerial attack struck the house of Muhammed al-Hibbi, killing his wife and all seven children when the roof collapsed on top of them, according to his cousin, Nuh Ahmed al-Hibbi.Human Rights Watch did not visit the impact site, but medical staff corroborated the number of casualties.
Targeting Saada: Unlawful Coalition Airstrikes on Saada City in Yemen
June 30, 2015 Human Rights Watch
This is Mwatana's report of the incident: