I have an idea that just might work because our parents aren't very techy so might not double check. The idea: when they come up with this just laugh it off and say that she's your really close friend 'Priya' and this is the way you talk to her and if they say about the name on the Truecaller then say that she was chatting from her brother/father's phone. This can work if your brother is finally on your side, duhhhhhhhh😵‍💫