Article Review ""Negative Maternal and Paternal Parenting Styles as Predictors of Children's Behavioral Problems- Moderating Effects of the Child sex"

I need to do an article review for paper attached "Negative Maternal and Paternal Parenting Styles as Predictors of Children's Behavioral Problems- Moderating Effects of the Child sex" . 

APA Format;  2 pages double space; Times New Roman; Due April 4 and will need revisions ASAP if I read it and something needs to change. 

These questions need to be answered in the article review paper  

Questions:

1.   What is the independent variable (and its levels) in this study?

2.   What is the dependent variable? (Note: There may be more than one dependent variable associated with this experiment.)

3.   Can you identify a serious threat to the internal validity of this experiment? Identify the threat and explain why it is a threat.