When you visit your partner’s friends and family, you should communicate before any encounter.
Gabriela recommends to ask for your partner’s help:
Make your partner understand that he/she needs to guide you when you are at his/her house or with his/her friends
You need to underline the fact that the situation is going to be demanding because you don’t understand the language.
He/she will have the role of being on your side and helping you navigate this situation.
“Be careful, it doesn’t mean becoming a translator! You can’t translate full conversations all the time, it’s exhausting. Your partner needs to be aware of the situation without being a full-time translator.”
https://myforeignhalf.com/en/how-to-survive-a-multilingual-relationship-6-tips-from-a-psychologist/