A more thorough explanation:

An uterine sister is a type of sister who shares the same mother but has a different father. This is a legal term used in civil law.

For example, if a woman has two daughters from different fathers, those daughters would be considered uterine sisters. They share the same mother, but their fathers are different.

Another example would be if a woman remarries and has a daughter with her new husband. That daughter would be the uterine sister of any children she had with her previous husband. They share the same mother, but have different fathers.

Understanding the different types of sisters, including uterine sisters, can be important in legal matters such as inheritance or custody battles.