Degrees of Prohibited relationship as per the Special Marriage Act 1954

Section 2 (b):

“Degrees of prohibited relationship” – a man and any of the persons mentioned in Part I of the First Schedule and a woman and any of the persons mentioned in Part II of the said Schedule are within the degrees of prohibited relationship.

Explanation (I) – Relationship includes, —

• relationship by half or uterine blood as well as by full blood;
• illegitimate blood relationship as well as legitimate;
• relationship by adoption as well as by blood;
• and all terms of relationship in this Act shall be construed accordingly.

Explanation (II) – “Full blood” and “half blood” – two persons are said to be related to each other by full blood when they are descended from a common ancestor by the same wife and by half blood when they are descended from a common ancestor but by different wives.

Explanation (IV) – In Explanations II and III, “ancestor” includes the father and “ancestress” the mother