Be yourself
It's important to be yourself when you're around your boyfriend's family. Don't try to be someone you're not or pretend to like things you don't. This will only lead to discomfort and awkwardness. Instead, be honest and genuine about who you are and what you like.
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Be patient
Building a relationship with your boyfriend's family takes time and patience. Don't expect to become best friends overnight. Take the time to get to know them and let them get to know you. Be patient and keep an open mind.
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Offer to help
If you're visiting your boyfriend's family, offer to help with cooking or cleaning up. This shows that you're willing to be a part of the family and contribute to the household. It also shows that you're respectful of their home.