Mama Murphy

"Mama" Murphy is a character in Fallout 4.

Background
Mama Murphy is one of the people taking refuge from raiders in the Museum of Freedom in Concord. She is a fortune teller, having the power of "Sight", claiming such power comes from chems. She may actually be a Psyker.

Mama Murphy uses chems to induce a trance-like state in which she claims to see "things that were, things that will be, and even some things that are, right now." She uses her power out of a desire to protect people she cares for, providing warnings of danger and advice on which courses of action to take.

Other interactions
Upon completing When Freedom Calls quest, Mama Murphy commends the Sole Survivor's success and reports the player character's son is alive, somewhere in the Commonwealth.

After giving her Jet she will request that the player character make her a special chair called Mama Murphy's chair.

She will continue giving vague, but ultimately true predictions with more and more basic chems, such as Buffout, Mentats, Med-X and Psycho. These predictions unlock new dialogue options that allow the Sole Survivor to avoid combat during main quest line missions, including Nick's rescue and the standoff with the synth courser.

After asking for Psycho and delivering the prediction that follows, she will die presumably of an overdose.

Alternatively, the Sole Survivor may pass a Charisma check to convince her to give up chems entirely, at which point she will lose the Sight.

Appearances
Mama Murphy appears only in Fallout 4.