In Jonas's world, as other commenters have noted, children do not live with their biological parents: all children (who are not "released" through death) are adopted. While many children in our world are adopted, myself included, it is certainly not the norm. We tend to highly privilege the connection between parents, most especially the mother (somewhat unfairly, I think), and their biological children. Even among families in our world where adoption is the norm, it is still expected that the parents develop strong emotional bonds with the children they adopt. In either case, intense emotion is prized; not so in Jonas's world. A more rational, reasonable love seems the norm for them.
Further, we place a high premium on our children's happiness; parents in Jonas's world place a high premium on a child's usefulness. If a child doesn't meet the requirements, he or she is released (i.e. killed). Then, once a child achieves adolescence, they are assigned their role in society, and each is expected to perform that role whether it makes them happy or not. Parents in our world place an extreme love and desire for the child's happiness at the center of their homes, but this is not the case in Jonas's world. Consider, Americans believe in "life, liberty, and the pursuit of happiness" above all things while Jonas's contemporaries are willing to kill children who do not measure up, deny them liberty by taking away their choices, and disallow them to pursue what makes them happy and prioritizing the needs of the state above the happiness of the child. Very different indeed.