Missing Children is an Odd Job in Chapter 14, "In Search of Hope", in Final Fantasy VII Remake, taking place in the Sector 5 Slums. While Cloud Strife, Tifa Lockhart, and Barret Wallace search for a way to the Shinra Building, they find Ms. Folia in the Sector 5 slums, who has lost her children.
This quest is a combat quest. Ms. Folia can be talked to in the northeast area of the Sector 5 Center District, by Chadley. After talking to her to begin the quest, the children are located in the Slum Public Cemetery. This is found by heading north from the Sector 5 Center District, then talking the east path at the fork toward the Nuts 'n' Bolts Hills, and then following the bridge across to the right when smoke can be seen. Oates can be found here.
Before talking to him, equip materia. These enemies are weak to Fire, so equipping the Fire Materia is effective. The Enemy Skill Materia should also be equipped to learn the Spirit Siphon ability from the enemies. Additionally, pairing Healing Materia with Magnify Materia on one character is ideal. Steadfast Block Materia is very useful on Cloud Strife and Barret, while Parry Materia is best on Tifa.
Talk to Oates to begin a battle with two phantoms. These enemies have powerful attacks, use ice spells, and can phase in and out of battle. Avoid their attacks by using Parry or guarding against them, and focus on staggering them with fire spells, Barret's Focused Shot, Tifa's Focused Strike, or Cloud's Focused Thrust. Once they are defeated, the Time Materia is obtained.
Hard mode tips
Preserving MP is important throughout this chapter, so instead of using fire spells, pair fire materia with Elemental Materia on characters and use physical attacks. Cloud should remain in Punisher Mode and use Counterstance after they phase out to counter their attacks, while Barret and Tifa should guard after they phase out and use Maximum Fury or Starshower respectively when they return. Use Barret's Lifesaver and avoid healing if possible, to take advantage of the nearby bench.
Defeating the phantoms earns Tifa the Way of the Fist Vol. X.