This may be really dumb, but in your opinion is papa grandpa or daddy? I think daddy because mama bear and papa bear. There has been a few people call my FIL Papa and I don't understand why.
My dad wants our daughter to call him papa. And my mom wants her to call her tutu. So papa and tutu. My husband sometimes refers to himself as papa too though. But we use daddy and dad too.
Re: Papa
For LO, FIL is Papa and DH is daddy.