Meeting my girlfriend’s older brother for the first time

Hi everyone,

I’m currently in a long-distance relationship and I’m really excited because, in the up coming month, her family is coming down, and they’ll be stopping by to meet me. I’ll be meeting her older brother for the first time face to face.

I want to make a good impression and show him that I genuinely care for his sister. Do you have any tips on:

• How to introduce myself?
• What topics to discuss (or avoid)?
• Cultural considerations I should keep in mind?
• Any activities you recommend for our time together?

Thanks in advance for your help!

Edit: just for clarification I'm 18m and my gf is 19, the older brother is around 40 I'm not sure what I can do to win his vote over.