We really love the Miller Family books. My friend, Kris Hage, actually wrote the Character Companion that goes with the books. She lists the following stories for the traits you listed:
Patience: Missionary Stories chp. 3 and 6
Focus: none specifically but here are stories for alert or attentive
Persistence: Missionary Stories chp. 23, 24, 25
Thoughtfulness: Prudence and the Millers chp. 15, Wisdom and the Millers chp. 16
Kindness: School Days with the Millers chp 8 and 15, Wisdom and the Millers chp 7 and 8