Apple ID issue
I’m trying to update a mobile banking app which version I am using is no longer working. When asked to update it prompts me to a sign in page to put my password for iTunes Store. My password isn’t being accepted so I went to forgot password to find it’s looking for my sons Apple ID with no option to change it to mine. I am signed into my own Apple ID on my phone so don’t know why this is happening. How can I change it so it asks for my Apple ID password and not my sons?