I know a couple of cases. All happy marriages.
1. Malay guy married to a Indian Catholic girl. No conversion. He stays Muslim, she stays Catholic. Children will decide which religion to follow when they're old enough. Malay guy's family and relatives didn't attend the wedding.
2. Malay guy married to a Chinese Christian girl. He converted to Christianity and was ostracised by his family. No Muslim friends or family attended the church wedding.
3. Punjabi brahmin guy married to a Malay girl. No conversion. He stopped taking pork out of respect for the wife. He was banished from his family until the first grandchild came along.
4. Chinese guy married to Malay girl. Both professionals. No conversion. Local mufti refused to grant a Muslim marriage here, so got married in a mosque in London. Children baptised as Muslims.