(1) A person who, taking into account their other duties, is incapable of paying maintenance without endangering their reasonable maintenance has no obligation to maintain.
(2) If parents are in this situation, they are obliged to their minor children to use all available funds equally for their maintenance and the maintenance of the children. Unmarried children of full age are equivalent to the minor children, until these attain the age of 21, as long as they live in the household of the parents or of one parent and are in general education. This obligation does not arise if another relative with an obligation to maintain is available; nor does it arise with regard to a child whose maintenance can be paid from its basic assets.