Answer:
Dear Mom,
I hope this letter finds you well. I am writing to you to share with you some of the problems that we are currently facing at home. I know you might be worried about us and I want to keep you in the loop.
Firstly, as you know, dad has been having some health issues and he is not able to work as much as he used to. This has put a great strain on our finances as we are struggling to make ends meet. We are trying our best to cut down on our expenses but it's not easy when we have bills to pay and groceries to buy.
Secondly, my grades at school have not been very good lately. I have been struggling to keep up with my studies and I am afraid that I might fail some of my classes. I am trying my best to catch up but it's not easy when I am also trying to help out at home.
Lastly, I miss you so much and I am finding it hard to cope without you. I know that you are doing important work overseas but I just wanted you to know that we all miss you so much. It's not the same without you here and I can't wait for you to come back home.
Anyway, I just wanted to update you on what's been happening at home. Please take care of yourself and come back home soon. We all love you and miss you.
Your loving daughter,
[Your Name]