In reply to your 1/22 post is the Father invisible? (fivedoves.com) God the Father is invisible in the sense that He is presently not seen by man.  

However, God the Father is seen in Rev. 5:1, "And I saw in the right hand of him that sat on the throne a book written within and on the backside, sealed with seven seals," and in Rev. 5:7, "And he (Lord Jesus) came and took the book out of the right hand of him that sat upon the throne."  Therefore, God, the Father seated on Heaven's throne will be visible to those born again believers who are taken to heaven.