So I was raised to believe I was Spanish but...

I just got my test results back, not a drop of Spanish blood in me. Mi abuela said she was half Irish/English and half Spanish which by proxy I thought gave me at least 12.5% Spanish heritage. My sister took the same test and doesn't have any either. Maybe my mother's one will show something but unless my dad just has really powerful genes, I'm kinda having an identity crisis right now, anyone got any advice?