We experienced this when my hubby's uncle passed away. Uncle did not get married and my hubby was supposed to do what son should do in traditional culture as non-believers. We couples are the only Christians in the whole family.
We prayed before the funeral and let the funeral organizer know we are Christians. Funeral organizers knew very well what Christians do and don't. they helped us avoid all don'ts naturally and passed what the traditional culture things my hubby was supposed to do to his brother, who is yet a believer.