2 typo in title
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I know how to talk someone into doing what they don't tentwant to do in AmE

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I know how to talk someone into doing what they don't tent to do in AmE

In eastern massage techniques there are some sensitive points on body (and even some particular veins) that the massage therapist takes them or massages them and in this way the therapist would be able to put someone into sleep easily.

In my mother language there is an idiom which is used when you want to say:

I know someone's sensitive points and I can use them if they disagree to do something and change their opinions (meaning that I will talk to them into doing that specific thing or somehow I can persuade them to do something.)

I've heard three different sentences than it seems they can be used in this sense, but first I have no idea if they are natural and second I don't no they work here or there is a better choice here.

My Scenario [a conversation between a brother and a sister]:

  • Dan, I'm sure mom won't buy that for us.
  • Don't worry Diana! .......

a) I have mother’s number when it comes to that.

b) I know what makes mom tick.

c) I know mother’s soft spot.