I'm still mourning my dead cat but not as much as I miss my great grandfather.
Are you more upset by your grandfather's death?
I simply loved my grandfather more because he's an amazing person.
It is normal to be attached to your pet cat and mourn it when it died. Your are right in that you care more for family than a pet thus you mourn more for your grandfather.
Whoa I think you're right.
I think it is okay to be sad about both and you don't have to feel ashamed either way.