best friend's family is convinced i'm gay..., =/ Options

[cori-catastrophe]

so to start off, i'm not. at all. now with the story.
my best friend's name is jessica. her grandma is staying with her until the start of april and she has been for a while. last weekend, i spent the night with jessica, my friend. she got her hair cut on saturday. she hated it, and i can't say i blame her. but as her friend, i was trying to make her feel better and i was telling her it didn't look as bad as she thought. so i was just told this today, but apparently when jessica's mom, her sister, her, and i went somewhere, her grandma told jessica's dad that she thought i was a lesbain. he believed her. so now i'm pretty sure they wont let me visit. how do i convince them i'm not?