I think my parents worked hard all of their lives and I admire them.
Why do your parents deserve your admiration?
Because they always loved us and provided for us.
I'm sure you are grateful to your parents for their hard work to provide for you. It's good that you recognize that and you should let them know how much they mean to you.
I'm so happy that they loved me as much as they did.
You're very lucky to have such great parents.  I'm happy for you too!