SHAFAQNA – The Grand Ayatollah Sistani answered a question about the kinship of the foster child who is breastfed by the foster mother.
Question: If a foster child is breastfed by the foster mother for one week continuously, who becomes Mahram (close relatives who caot marry this child later on) to the child?
The Grand Ayatollah Sistani: The breastfed child becomes Mahram to the person who breastfeeds the child and her husband and her children.
Source: PERSIAN SHAFAQNA