He can take up poverty as an independent variable too and compare the two studies.
Explanation:
In this study, to understand the relationship between parental education and poverty, Juan must take into account various things that lea to less education and poverty.
In the case he is taking up he will be able to establish the relationship between having less or more education and being poor as a result.
If he takes poverty as the independent variable and education as the dependent variable he will see the other side of the picture.
The relationship between being poor and then access to education is also important for such a study.
