Explaining poor grades in application? I am applying to a Masters Program at a top university. I already have a Bachelors and a Masters degree, in addition to work experience. I have strong letters of recommendation and my Masters degree grades (both quant and social sciences) are excellent (all A's). Unfortunately,  during my bachelors degree I had some serious personal issues with a parents health, which resulted in me not being able to handle the course load for a couple of semesters, resulting in some poor grades (few Cs and a D).  My overall GPA still ended being well above average and majority of my grades were still A's. 

Should I explain this in my application or simply focus on the strengths of my application? I will not be including this in my personal statement but there is an option to provide additional info. On the one hand, I feel like these poor grades are a blot on my record (some poor grades sprinkled among As) and not a good reflection of my potential. I basically went through a tough time where my life was so uncertain that I couldn't properly plan my course load or withdraw from courses on time. These courses were quantitative, which is relevant to the program I am applying to. At the same time, I feel like adding this info in my application might draw attention to the negatives or make it seem like I'm shirking responsibility.
You should explain.

Unlike (say) mental health problems, there is no stigma attached to having a parent in ill health. If you don't explain, people will be wondering what the reason for the bad grades was, and whether it was mental health problems or some other cause that reflects poorly on you. If you explain, they they will know what caused them and will see these bad grades in a much less negative light.