A team of investigators found the remnants of missiles manufactured by Marconi Dynamics.
The three brothers were waiting for their brides' party to arrive when a missile hit their house.
Medics and locals officials have confirmed two houses were struck by bombs, killing mostly civilians.
Millions are at risk of starvation, injury and death in the war-torn country.
Prime Minister Khaled Bahah spent months working from exile in Saudi Arabia with Gulf Arab allies to fight against Houthi control of the country.
Ten million children in the conflict-torn country need urgent humanitarian assistance, UNICEF says.
Nearly 2,000 people have died since Saudi Arabia–led airstrikes began in March.
Two-thirds of the population are now without drinking water as UN ceasefire talks are suspended indefinitely.
Kerry pledged $68 million in aid for humanitarian groups working in Yemen during a visit to Djibouti on Wednesday.
"We need to focus all efforts we can on an international mediation," the European Union's foreign policy chief said on Wednesday.
Oxfam claims Riyadh air strike hit store in Houthi-held Saada containing humanitarian supplies despite knowing its location.
Aid required for 7.5 million people in Yemen as air strikes hit 18 of country's 22 provinces.
Islamabad will not sanction support for Saudi airstrikes over concerns of stoking anti-Shia sentiment, say analysts.
Warplanes from a Saudi-led air coalition bombed a military base in central Yemen controlled by Houthi fighters and their army allies, and a website of the Houthi-run defence ministry said two students were killed at a neighbouring school.
The need for humanitarian workers is growing as fighting continues in Yemen.
Food, water and electricity shortages throughout country as foreign warship reported shelling Houthi positions outside city.
Worst fighting in Saada and Hajja provinces in six days of Saudi airstrikes, say residents.