Timeless love. Even death does not part them. If anything it draws them closer together. He's a bit eccentric and she loves him for it. She a bit aloof but she is his universe and he adores her. They are both excellent parents that communicate with each other and their children. They are fully supportive of whatever interests their children are perusing.

Arthur and Molly Weasley, Ron's parents, also fall into this category. Admittedly we saw them in hard times but they never wavered in their kindness and compassion to one another and others.

I know it's not exactly the same, but I always felt the parents from Easy A had a great thing going.

Check out the movie Undercover Blues! It's an older one, but the main characters have a great relationship.