Comment by _hhkc

Create separate contacts for each of your parents with their real names. Then, go into your contact card (aka “My Card”) and relate your parent’s contacts, one as mother, the other as father under “related names”. This will let Siri, and the rest of the system, know who your parents are. Also make sure that in Settings -> Siri & Search -> My information, you have the right contact card selected for yourself.