Why does my iPhone ask for an old Apple Account to update apps?

Every time I try to update a app it asks me to confirm my password to a old account that’s my dads I used to use that account as a shared one and now I have my own account and now every time I try to update a app it asks me to confirm my password to it my dad says he deleted it and when I do put in the old password it tells me to put in my trusted number and nothing works

[Re-Titled by Moderator]