Dear Mom and Dad:

I wanted to take a few moments to write you a letter letting you know just how much I appreciate all that you have done for me throughout my life. As I grow older, I've come to realize just how much you have sacrificed for me and how much you have always been there for me, no matter what.
From the moment I was born, you both have been there for me, through all the good times and the bad. You have always been my biggest supporters, whether it was cheering me on at swim meets or helping me with my homework. You have always been the ones who have seen me through all of life's ups and downs, and for that, I am forever grateful.
Looking back over the years, I see how much you have sacrificed to give me the best life possible. You worked long hours to put food on the table and a roof over our heads, and you never once complained. You gave up so much of yourselves to ensure that I had everything I needed to succeed in life, and I cannot thank you enough for all that you have done.
But more than the material things, it's your love and guidance that have meant the most to me. You have always been there to lend a listening ear and offer words of wisdom when I needed them most. You have taught me so much about life and how to navigate all of its challenges, and that has been invaluable to me.
So, Mom and Dad, I just wanted to take a moment to tell you how much I love and appreciate you. I know that I have not always been the easiest child to raise, but you both have always been there for me, no matter what. I hope that I can be the same kind of parent to my children as you have been to me, because your love and guidance have made all the difference in my life.
Thank you for everything you have done for me. I love you both more than words can express.
Sincerely,
[Your Name]