That bond is a very important one, one that many people have. The bond differs from person to person...I have read or heard about pretty close bonds, and I wanted to share them.
My dad watched a movie called District 9, about aliens who landed on Earth, in fact, near Johannesburg, South Africa, I think. I was pretty freaked out by the movie since the main character had something happen to his arm and started turning into an alien little by little or something... We call the main character the "sweety man" because in fact, in the movie, he had tried to tempt out an alien child by saying "It's the sweety man!". So now we're addicted to saying "sweety man". But anyways, the point is, that even the aliens cared a lot about their children. It was the sweety man's job to move the aliens to a new camp outside of Johannesburg, so then he tried threatening to take away an alien's child unless they moved to the new camp. The alien, who was previously calm, then became very worked up and upset.
And then there are cats and their kittens. My dad's friend is getting a cat soon, from a "cat club" that was set up at my dad's workplace, what with lots of stray cats hanging around Cisco's buildings. Apparently someone who helps take care of the cats came up to my dad and said he was very worried about the mother of the cat that was getting adopted. He said the mother was fretting and stressed because she didn't know where her child had gotten off to suddenly. My mom thought the solution would be for my dad's friend to adopt the mother and its child (but I doubt their family was planning to get two cats). Either way, I hope that the mother cat can see her child again. If she did, then she would know her child was safe (and hopefully happy and well taken care of) and then she wouldn't have to worry.
Guardians aren't always in the form of parents. Sometimes grandparents serve as the parental figures. I started reading a book, and when the mother of the main character's friend mentioned that not doing something would be like child abuse, then the grandmother of the main character allowed the main character to do something that she'd forbidden until then. The grandmother was always concerned about someone taking her granddaughter away from her, because they might think she was too old to take care of a child, or something. So hearing "child abuse", even if the person only meant it figuratively and not literally, probably made alarm bells go off in her head.
But sometimes the relationship between parents and their children are...less than perfect. A good example is Alice and Kev (yep, that's a link, click on it!), a story about a homeless girl and her father, created with the Sims 3. Unfortunately there isn't really an ending to the story. But it's pretty cool, seeing a video game being used to tell a compelling story.