I think you should talk to them about it.
Don’t make it behind there back,
imagine how much trouble you get in when they do find out?
they always find out eventually.
talk to them and tell them why, & what you will be doing on there.

you should just make it and not tell them

telling them has its pros and cons

they will trust you but it means they can demand to check your account

so make it and don’t tell them