In his prophecy in Isaiah 9:6-7, Isaiah gives four names for the coming Messiah that describe what His ministry would be about. Each of these names is significant. They talk about Jesus' ministry while He was on earth and the way He ministers to us till today.
Earthly relationships will always have issues and challenges. They will break down. And they will be far from perfect. But they are glimpses of what Jesus was coming to be as the Messiah and still is today for us.
Jesus is the One who will always be there to care for us and to protect us from destruction by our enemy. He will never fail us. The prophet Isaiah was telling us this when he spoke of the coming Messiah.
The challenging part of seeing Jesus as everlasting Father, is that we get it mixed up with the sometimes challenging reality of our earthly relationships. Because we take our mixed up human relationships and see our relationship with God as being the same way.
But, Jesus wants to come and transform our view of God as Father. When we look at Jesus' relationship with His Father, we see an example of what our relationship with God as Father should be like. We have to allow Jesus to come in and transform our understanding of God as Father, because this descriptor of God given by Isaiah is just as important as all the others.