1. Check with the local civil affairs bureau, and you need an ID card or household registration book.
2. Consult your friends, but make sure you have a notarized power of attorney.
3. Ask about the daily life of neighbors.
4. Visit your parents and learn about your marital status through chatting.
5. Ask yourself directly, but it is easy to cause unhappiness.
It should be noted that inquiring about other people's marriage registration information needs to comply with relevant laws and regulations, otherwise it may infringe on others' privacy rights.