fallout

There's no question that some of the Directorate, and the Institute at large, will need reassurances about your appointment.Father
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Pinned is an Institute main quest in Fallout 4.

Quick walkthrough

Institute main quest: Pinned 
Speak to Father
Travel to Graygarden homestead
Speak to the Minutemen contact/Encounter the hired gunners. 
Kill the Minutemen/Gunners. 
Pass a speech check to convince the Minutemen to stand down. 
Side with the Minutemen. 
Speak to Enrico Thompson
Speak to T.S. Wallace
Reward: 500 XP 
Leads to: Powering Up 

Detailed walkthrough

The quest will start by talking to Allie Filmore in the Institute and completing Mass Fusion. She will mention that Father is anxious to get the Sole Survivor involved with something else. Upon meeting him, Father will be talking to Dean Volkert as part of a health exam. He will cut the conversation with Dean short and explain to the Sole Survivor that he needs their help in assisting an Institute team sent out to invite T.S. Wallace, a wastelander who could help with the reactor. Wallace has called in the Gunners to defend him or the Minutemen (if Taking Independence has been completed) to help, which has complicated the mission. Father will tell the Sole Survivor to resolve the situation and bring back Wallace alive. Wallace's house can be found west of Graygarden, and upon arriving there, a team of Gunners or Minutemen can be found in front of it. The Gunners can be eliminated, allowing the Sole Survivor to enter the house and continue the mission. If the Minutemen are there, the player has three choices:

If the Sole Survivor sides with the Minutemen, the Institute forces will become hostile. Defeating them will immediately make the Sole Survivor an enemy of the Institute, beginning Banished from the Institute and locking the Institute ending out for the remainder of the playthrough.

Once inside the house, the player will be greeted by Enrico Thompson who explains that he needs help convincing Wallace, who is locked inside his room, to come with them. Wallace can either be calmed with a medium persuasion check or threatened with a hard persuasion check, after which he will agree to accompany the Institute team. If both checks were failed, Enrico will mention they are out of time and he will relay a synth inside Wallace's room to subdue him. Once he is dealt with, Enrico will comment on the outcome and the quest will finish.

Quest stages

Quest stages
StageStatusDescriptionLog Entry
10 Speak to FatherI need to check in with Shaun.
20 Reach the HouseA team from the Institute was sent into the Commonwealth to secure someone who can help with the reactor. I need to make sure they're all right.
30 Speak to Minutemen Contact
40 Eliminate the Opposition
50 Speak to Enrico Thompson
60 Speak to WallaceT. S. Wallace has been invited to join the Institute. He needs to be convinced it's the right thing to do.
80 Eliminate the Institute Forces
200Quest finishedQuest completeMr. Wallace has been safely delivered to the Institute.
1500Quest failedQuest failed

Companions reactions

EventCaitCodsworthCurieDanseDeaconHancockMacCreadyPiperPrestonStrongValentineX6-88LongfellowGage
Ask the Minutemen would they risk being wrongNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionLikeNo reactionNo reaction
Tell the Minutemen there's no dangerNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionLikeNo reactionNo reaction
Tell the Minutemen they can work together with the InstituteDislikesLikeLikeHatesDislikesNo reactionDislikesLikeLikeLikeLike
Threaten the MinutemenLikeDislikesHatesHatesHatesDislikesLikeDislikesDislikesLikeDislikesLike
Tell Enrico it's worth itDislikesNo reactionNo reactionHatesNo reactionNo reactionDislikesNo reactionNo reactionLikeNo reactionLove
Tell Enrico it's lots of effortLikeNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionNo reactionNo reaction
Tell Enrico "you screwed up"LikeDislikesDislikesLikeNo reactionNo reactionLikeDislikesDislikesLikeDislikesDislikes
Tell Enrico "you're welcome"DislikesLikeLikeNo reactionNo reactionDislikesNo reactionNo reactionNo reactionNo reaction
Tell Enrico you're there for the InstituteDislikesDislikesDislikesHatesDislikesDislikesDislikesNo reactionDislikesLove
Tell Enrico "screw you"LikeDislikesDislikesNo reactionNo reactionLikeDislikesNo reactionLikeDislikesHates

Notes

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