You can write Grantor beside your name, underneath or it could be the start of the Title, by the Grantor, Esther……, you could even put (Mother) next to your name here. It is a claim that you are making, by expressing it with your intent of your position. You are the Grantor of the Original Trust Document, The Source document (COLB/SOB), which they hold in custody. A Trust works with 3 main elements, A Grantor, the one granting the property to a Trustee, who holds the Property (in trust) for the benefit of the Beneficiary. So the Original Title (paperwork, not substance) is the main document that the other trusts (BC, TFN, SSN), are built on.
Whatever document, declaration, affidavit, etc you are signing, you are doing as the Grantor, Expressing your Will and your Intent to what is happening. It was your Signature, that granted it in the first place.