Simple English definitions for legal terms
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A collateral line is a family connection between people who are not directly related to each other as parents or children, but who share a common ancestor. For example, cousins are part of a collateral line because they have the same grandparents but are not siblings. This is different from a direct line, which is a family connection traced only through parents and children.
A collateral line is a line of descent that connects individuals who are not directly related to each other as ancestors or descendants, but who share a common ancestor.
For example, if John and Mary are siblings, their children are in the direct line of descent. However, if John and Mary's cousin, Tom, has children, those children are in the collateral line of descent because they share a common ancestor (John and Mary's grandparents) but are not directly related as ancestors or descendants.
Collateral lines can be important in legal matters such as inheritance and property rights.