I am looking for anyone related to John Parten of Robins Iowa he was my grandfather?

Question

I have never met any of my dads family other than his brother and half sister

Answer 1

Robins is in Linn County.

http://genforum.genealogy.com/ia/linn/

is devoted to Linn County. The genealogical society there will look up his obituary and send it to you for $5. That will list his survivors. Some of them may still be in the towns they were in then. You could try a post on the Linn County site (above) too.

Answer 2

Go to the following website and enter all the info you know about him.

There are 74 John Parten's listed.  That might help to find who else is researching the same person.  I have a John Parten in my ancestry but my John would be several generations back.