Not only do you need to locate the Mice's parents in the sewers, you also need to feed them in Valor Mortis to complete the Mummy and Daddy quest. The quest starts and ends in the sewer, so you don't have to travel anywhere else. The area is dangerous, though, and some spots are toxic or guarded by dangerous enemies. Luckily, there are plenty of shortcuts, so you don't have to worry about how to complete the Mummy and Daddy quest in Valor Mortis.

Discover the Finders Keepers quest Silver Cache location in The Blood of Dawnwalker.

The moment you enter the sewers and activate the lantern, speak with the Mice behind the ladder to start the Mummy and Daddy quest in Valor Mortis. They give you some cheese to feed them and ask you nicely to help.

Keep going to find more enemies and a grapple that can take you to the other side.

Defeat the pair of Carrions and the Spewer before proceeding deeper into the corridor.

Try to backstab the patrolling enemy and to shoot the far-away ones to kill them quickly.

At the end of the path is a Volunteer that will shoot you dead or burn you. Defeat him and use the ladder to go down where there are two Risen Grenadiers.

There's a chest you can take the Sewers Key from to explore more areas of the sewers, so make sure to grab it.

Before going anywhere, use the Fire Transmutation to burn the webs and reveal a hidden path.

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