(1) To the extent that a relative, on the basis of section 1603, has no obligation to maintain, the relative liable after them is to pay maintenance.
(2) The same applies if the prosecution of rights against a relative within the territory of Germany is excluded or substantially more difficult. The claim against such a relative, to the extent that another relative obliged under subsection (1) pays the maintenance, passes to the latter.
(3) The maintenance claim of a child against a parent, to the extent that, subject to the prerequisites set out in subsection (2) sentence 1, another relative who is not liable for maintenance, or the spouse of the other parent, pays maintenance in place of the parent, passes to the latter. Sentence 1 applies accordingly if a third person pays the child maintenance as father.
(4) The devolution of the maintenance claim may not be asserted to the disadvantage of the person entitled to maintenance.