AT THE START OF THE SEASON BLAINE SAID HE MOVED BACK IN WITH HIS PARENTS, SO MAKE OF THAT WHAT YOU WILL. THERE WAS NO MENTION OF SANTANA'S DAD EITHER. IIRC THE LAST REFERENCE TO HER PARENTS PLURAL WAS IN IKAG IN S3, AND THERE WASN'T ANYTHING TO RULE OUT THEM NOT BEING TOGETHER, BUT PRESUMABLY HE AND SANTANA AREN'T ON BAD TERMS SINCE THERE WAS SUCH A BIG DEAL OVER HER ABUELA.