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(a) The following are obliged to support each other—
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(1) husband and wife;
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(2) legitimate ascendants and descendants up to 18 years of age;
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(3) parents and children and the legitimate descendants of the latter up to 18 years of age;
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(4) the adopter and the person adopted; and
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(5) parents and illegitimate children who have been recognized as children by written acknowledgment of the natural parent or by decree of a competent court.
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(b) Brothers and sisters also owe to their brothers and sisters, even when only on the mother’s or father’s side, the aid necessary to maintain their existence, when through a physical or mental defect or for any other cause not the fault of the person requiring support, such person cannot provide for himself.
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(c) With such support is included the expenses necessary for the elementary education and teaching of a profession or trade.