The following types of relationships constitute impediments to marriage:
- Parents with their own children, grandchildren or great-grandchildren.
- Brothers-in-law and sisters-in-law.
- Uncles and aunts with nieces and nephews.
- First cousins with each other.
- Foster parents with foster children or foster children with the children of foster parents.
- Godparents with godchildren or godparents with the parents of their godchildren.