These D Rank missions always have their objectives in the same locations, but often new players have trouble finding them due to their ambiguous mission objection description.
The child's home is in a round building between the Nakano Shrine and the Police Department, you can identify them by the Uchiha crest banners. (Picture One)
The Mother is sort of hidden in the corner of the round empty home so I circled her for you. (Picture Two)
When facing to the outside of the village at the gates, the cat's location is on a building to the left hand side. Here is a frame of reference, Note the ANBU with blond hair to help find the cat. The cat is behind that rectangle.(Picture Three)
You should be able to see the hokage building in the distance from this point, and I circled the cat for you. (Picture Four)