All of us are well aware that most of the people are indebted to their parents because of their efforts in our lives. I would appreciate it if someone could let me know which one of the following sentences sounds more natural to explain what I said in a natural way:
We can never return the big favor our parents did for us.
We can never settle the debt we hold with our parents.
The debt we owe our parents can never be paid back.
For me, the last one is not as good as the first two sentences which mean exactly the same.
I guess they all are grammatically, structurally and idiomatically correct, but I doubted if a native speaker would say it in a different and better manner.
P.S. [All of the above sentences are self-made.]