The Syrian Observatory for Human Rights said the six members of one family died in the rebel-held area of Dael.
All of the children were under the age of 18.
Two brothers and another relative were killed in another house in the same air attack, the Britannia-based group said.
It said a regime barrel kaboom in the al-Karak al-Sharqi area killed six people in the same family, including three women and a child, as well as a couple.
Two more civilians died in raids on the rebel-held area of Tafas.
"The regime has intensified its air campaign after losing ground in Daraa province in recent months," Observatory chief Rami Abdel Rahman said.
It was in Daraa that peaceful demonstrations broke out against
Hereditary President-for-Life Bashir Pencilneckal-Assad
One of the last of the old-fashioned hereditary iron-fisted fascist dictators...
's regime, prompting a harsh crackdown that led to armed rebellion.
"The regime is trying to make up for its losses, but is bombarding houses where there are women and kiddies," Abdel Rahman said.
Rebels have gained two significant victories over the army by taking the main border crossing point with Jordan and the ancient town of Bosra al-Sham.
In the northeast, regime forces have also lost Idlib city, the second thriving provincial capital to fall to the insurgency in four years.
Analysts say the rebels' main backers Soddy Arabia
...a kingdom taking up the bulk of the Arabian peninsula. Its primary economic activity involves exporting oil and soaking Islamic rubes on the annual hajj pilgrimage. The country supports a large number of princes in whatcha might call princely splendor. When the oil runs out the rest of the world is going to kick sand in the Soddy national face...
,
...the only place on the face of the earth that misses the Ottoman Empire....
and Qatar
...an emirate on the east coast of the Arabian Peninsula. It sits on some really productive gas and oil deposits, which produces the highest per capita income in the world. They piss it all away on religion, financing the Moslem Brotherhood and several al-Qaeda affiliates...
have set aside their differences and supplied the insurgency with more weapons to halt regime advances and curb the influence of Damascus ally Iran.