THUS :

1.) Shia's because of their (peculiar) beliefs are outside the pale of Islam and as such Kafir's. Hence Islaamic bonds like :-
2.) Marriage with them ;
3.) Using their Zabiah (Slaughter) ;
4.) Saying the funeral prayer of their dead ones;
5.) Allowing them to participate in the funeral prayer of Sunni Muslims;
6.) Making them shares in Qurbani i.e. sacrificial animals on Eid al-Adha ;
7.) Making them witness in the Nikah of Sunni Muslims;
8.) Accepting their monetary contributions for the building of Masjid ------- all these things are not permissible (in Shari’ah) and should be given up forthwith. Anyone who does not do so is outside the pale of Islam and is similarly like the Shia's.