In muslim 1st cousin is the 1st choice(Hak Lagne) same way in Nepal Thakuris also marry their cousins for example King Birendra,Gyanendra,Dhirendra,Queen Aishwarya,Komal and Prechhya they all were  Juddha Sumsher Grand Childrens.

In Bahun Kathmandu's ex Deputy Mayor Mrs Kanchan Mala Chalise D/O Mr Ranjan Raj Khanal was married to her Bhanij Daju(Ranjan Raj's Bhanja) Mr Bidyut Raj Chalise so you will not be 1st couple if you marry her.