I'm going to judge my parents and siblings for bawling their eyes out at my grandma's funeral
Why would you judge people trying to grieve a loss?
A person losing a family member isn't an excuse enough for me to cry my eyes out and thereby be acting like a loony.
Everyone handles loss differently and you should respect that. It is unfair to think you know how someone else feels about the loss of their loved one
Grandmas are old people. Old people die of old age all the time.
That's true but it doesn't make what you are saying any less insensitive. You should be more empathetic of other people in your family who are grieving.