Summa Theologiae by St. Thomas Aquinas
XP: Treatise On Contrition
Q[54] Of The Impediment Of Consanguinity
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We must next consider the impediment of consanguinity. Under this head there are four points of inquiry:

A[1] Whether consanguinity is rightly defined by some?

A[2] Whether it is fittingly distinguished by degrees and lines?

A[3] Whether certain degrees are by natural law an impediment to marriage?

A[4] Whether the impediment degrees can be fixed by the ordinance of the Church?