Will asks, do we "confiscate children whose parents violate their special relationship-relative positive rights?" We already do. Sadly, children are confiscated every day from abusive or neglectful homes. Bad parents are "fined, jailed or otherwise punished."
It may be impossible to (1) provide support the children of poor parents (2) while at the same time not creating incentives for irresponsible behavior and (3) not unduly interfering with individual decisions regarding lifestyle and parenting.