Final answer:
Without more context, it isn't possible to accurately answer how the Uchtdorf's joined a church or who introduced them. More details are required to give a precise response, especially if the question is about Dieter F. Uchtdorf of The Church of Jesus Christ of Latter-day Saints.
Step-by-step explanation:
The question about how the Uchtdorf's joined the church and who introduced the family to the church seems to be related to a personal story or specific historical context rather than general information. Without the proper context or additional historical details, it's not possible to provide a factual and accurate answer. If the question refers to Dieter F. Uchtdorf, a well-known leader in The Church of Jesus Christ of Latter-day Saints, more details would be needed concerning the time period and circumstances to provide a precise answer. However, the included excerpts do not supply enough information to answer the question fully.