marriage in same gotra


Both Manu as well as Matsya Purana prohibit marriage with sapinda relatives on the mother's side and sagotra relatives on the father's side.


Quoted in Dharmakosa -
असपिण्डा या मातुरसगोत्रा च या पितुः /
सा प्रशस्ता द्विजातीनां दारकर्मणि मैथुने //


Dharmakosa, pub. Prajna pathasala mandal, Wai, Satara. III.1.p.177 ff