Is this an unreasonable request?

I am currently in the hiring process for a new family. The position has been offered to me and my acceptance is pending contract and payment details. The family are first time parents and have never hired a nanny before, so we are making the contract a collaborative process as I have worked in this industry for a long time, and know beneficial things to include that they might not know to think of. One thing I’d like to include pending their agreement to it, is that I’d like to propose the idea of an annual review along with a contract renewal that will also apply a minimum guaranteed 3% annual raise (cost of living) but may exceed up to any percent that the employer see’s fit based upon employee performance (merit).

Would this be an unreasonable proposition? I don’t want to scare my family away with this but I also plan to be with them for many years and would like to know that while my experience is increasing, that my pay is as well.

Update: I had the contract meeting and it was approved and the family also felt it was a very reasonable request! To those who advised against it, let this be a lesson for yourself in the future that you should always stick up for yourself, you might get what you want! I know I did. 😊