562. Representation is a fiction of law, the effect of which is to put the representatives in the place, in the degree and in the rights of the person represented.
563. Representation takes place without limit in the direct line descending; it is allowed whether the children of the deceased compete with the descendants of a predeceased child, or whether all the children of the deceased having died before him or her, the descendants of these children happen to be in equal or unequal degrees amongst themselves.
564. Representation does not take place in favour of ascendants; the nearest in each line excludes the more distant.
565. In the collateral line representation is admitted only where nephews and nieces succeed to their uncle and aunt concurrently with the brother and sister of the deceased.
566. In all cases where representation is admitted, the partition is effected according to roots; if one root have several branches, the subdivision is also made according to roots in each branch, and the members of the same branch divide among themselves by heads.
567. Living persons cannot be represented, but only those who are dead.
A person may represent him or her whose succession he or she has renounced.