Kindly refer to the following link(s):
If Shia gives Salam can we reply back?
If Shia are so bad why do they enter Mekkah and Madinah
Is there any enmity between Suni and Shia?
Do the Shia really follow the teachings of Ali Radi Allahu anhu?
Should we maintain ties of kinship with our Shia relatives? (relatives curse companions)