Whether affinity is an impediment to marriage?

❌ Objection 1 : It would seem that affinity is not an impediment to marriage. For nothing is an impediment to marriage except what is contrary thereto. But affinity is not contrary to marriage since it is caused by it. Therefore it is not an impediment to marriage.

❌ Objection 2 : Further, by marriage the wife becomes a possession of the husband. Now the husband's kindred inherit his possessions after his death. Therefore they can succeed to his wife, although she is affine to them, as shown above (Article [5]). Therefore affinity is not an impediment to marriage.