Is it bad??!

So I been with my boyfriend for 4 months and next month it will be my birthday and I plan to celebrate it at a bar like usual. I will be taking my brothers and of course my boyfriend. Now my question is is it bad luck for my brothers to meet my boyfriend first instead of being my parents? This might sound like a dumb question but I have heard it could be bad luck if you bring him around to soon.. Any advice? Please...