Where did anybody say that the parents said to IR "show us where the minnows are?". The sheriff said the three of them (Vernal, Jessica and Isaac) went off to go fishing. Vernal said in the EIN interview that he found minnows and thought Deorr would be excited to see them. Are you maybe combining those two comments and bending them into something else?
In the Vilt interview he (Vilt) states they told him they took IR with them to show them where he found the fish. This is also where Vilt states JM keeps stating "I kept looking back"