Meena's father is arun then arun is the _____ of meena's father?

It is not clear what you are trying to ask. What is "arun"? If that is a name, it should be capitalized, and then you can say "Meena's father is Arun then Arun is the name of Meena's father." I notice you have a problem remembering to capitalize names. I don't notice any other way to interpret this, and what I have worked out is trivial. So I just don't get what you are trying to ask.