A digital consent on a form records a name alongside the signature. Normally that is the name on the profile filling the form in, which is exactly right when the user signs for themselves.
It is wrong when somebody else signs. On an application filled in by a minor, a consent meant for a parent or guardian would carry the child's name. You can now mark a consent as signed by another party, so the person signing types their own printed name and, if you want it, states how they are related to the user.
This article is for administrators who build forms.

It decides whose name is printed next to the signature.
On the consent itself, not on the form as a whole, so one form can mix both kinds.
If you leave the signer label blank the consent still works. The form simply says "Signed by someone else" instead of naming a role.
A label beside the consent title telling them who is expected to sign, carrying your signer label.
When they tick the consent box, the signing area opens with:
Save stays unavailable until the printed name is filled in, so a consent cannot be signed anonymously by mistake.
Yes, and it is your choice. Tick Also ask how the signer is related to the user when you set the consent up. It only appears once you have chosen that somebody else signs.
The signer then picks one of:
Choosing Other opens a short free text box. That covers a grandparent, a foster carer, or a signer who is not a family member at all, such as a teacher or a coach.
Leave the tick box off and the signer is asked for a name only, which is all most organizations need.
Everywhere the consent is presented as a record:
The relationship, where you collect one, appears alongside the name in the same places. Consents signed before you changed the setting keep showing the profile name, so old records are not rewritten.
Yes, and that is the setup this was built for.
Add two digital consents to the form. Leave the first on The user filling out the form so the applicant signs for themselves, and set the second to Someone else, for example a parent or guardian. Each one gets its own title, its own wording and its own signature, and the imprints carry two different names.

Yes. A consent set up this way asks for the printed name, and the relationship where you collect one, in the app exactly as it does on the web. You do not need to build a separate form for people who apply from their phone.
Nothing. Every existing digital consent sits on The user filling out the form, which is how consents behaved before this setting existed.
Changing the setting affects consents signed from that point on. It does not alter signatures already collected.