This is not the best idea, to be frank.
I’m very sorry you have had a tragedy in your family.
Your guidance counselor doesn’t want to mention this. Most here believe you shouldn’t mention this, and I agree. Why? Because you are drawing attention to something that isn’t a problem. Missing two weeks of school and still keep your grades high isn’t a big issue, to be honest. A couple of B’s are not a problem.
What is your goal by sharing this information with a college? If it’s to elicit sympathy, it may well backfire. During the last few years, countless people have experienced all kinds of tragedies, and as awful as your experience has been for you, trust me that there are people who have experienced far worse. To be blunt, colleges don’t admit people because they feel sorry for them.
If the goal is for them to think that you’re unique because you managed to keep your grades high despite the last couple of years, that might also backfire. There isn’t a reason that you deserve an edge over another student because you were able to keep doing what you are supposed to do.
I’m sorry to be so blunt. Provide this information if you like, but be aware that it might not have the effect you intend.