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From the point of view of a person, named the root (tronco), these lines are labeled as follows (e.g., for purposes of inheritance):

Straight (Recta).
A straight line of ancestors and descendant.
Descendant line (línea descendiente).
Children, grand children, great grand children, etc.
Ancestor line (línea ascendiente).
Parents, grand parents, great grand parents, etc.
Collateral (Colateral o Transversa).
Relationships between blood relatives not related by direct descendance or ascendance.
Prefered (Preferentes).
Siblings and nieces and nephews (i.e., two and three degrees apart, respectively).
Ordinary (Ordinarios).
Uncles, cousins, etc. (i.e., four to six degrees apart).
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