The Palestinian Ministry of Health in Gaza has said an Israeli missile caused the fatalities, striking a home belonging to a family in the city of Khan Yunis, the International Middle East Media Center reported on Friday.
The ministry said the projectile also wounded more than 10 Palestinians.
Nine others were also killed earlier when an Israeli warplane attacked a house in the al-Nuseirat refugee camp, near the central city of Deir al-Balah.
Rescue workers also found another body at the site of Israel’s recent strike in Shejaiya neighborhood.
Israel has been targeting the Gaza Strip with military attacks since July 8. The air, sea and land strikes by Israel have so far killed at least 1,458 people and injured over 8,300 others.
This is Israel’s third major offensive against the densely-populated Gaza Strip over the past six years.