Parents can exploit their children labor. However it is not parental exploitation that is the source of the problem. Rather it is capitalism, which has swept away the economic basis of the family and denigrated parental authority into a mischievous use of power. The forces of production are reshaping traditional family relations. The peasant is eliminated in this sphere and replaced by the wage laborer.
Scientific methods replace the irrational, old-fashioned methods of agriculture.
The old bonds of agriculture are transformed. The union of agriculture and industry violates the traditional methods and consequently violates the conditions necessary for the lasting fertility of the soil. The same processes that happen in the factory are present in the agriculture sector. The environment suffers equally with the worker. All progress in increasing the fertility of the soil for a given time is a progress towards ruining the lasting sources of fertility.