It is important to note that the notion of a brother and sister also includes sisters and brothers that have the same father or the same mother.
Such approach is expressed in the decision No. YEAKD / 1516/02/08 of the Court of Cassation on the civil case on 24.07.2003:
Moreover, sisters and brothers that have the same father or the same mother are heirs of the second priority by inheritance.

Iren Sargsyan,
Notary Public of Achapnyak District.

“Public Notary Clarifies” heading is the joint initiative of Iravaban.net and the Notary Chamber of the RA, which is aimed to raise the level of legal awareness of the population.

Source: Iravaban.net