Children or offsprings of the parent are called Siblings. They may be sons or daughters. They may share the same mother but different fathers (in which case they are known as uterine siblings or maternal half-brothers/half-sisters), or they may have the same father but different mothers (in which case, they are known as agnate siblings or paternal half-brothers/half-sisters. They are genetically related with parents.
So, the correct option is ‘sons and daughters of the same parent’.