The answer to this question may have many different explanations, because language and culture are very complicated and diverse. Here are some possible explanations:

1. honorific words: In some cultures, it is a common habit to use "father" or "mother" as honorific words. This may be one of the reasons why people in Taiwan Province Province use "Mom and Dad" as their address.

2. Intimate appellation: Another possibility is to use "Mom and Dad" as the appellation, which is an expression of intimacy. In the culture of Taiwan Province Province, using "Mom and Dad" as a title may show kindness and friendliness to each other.

3. Language habit: Finally, this title may just be the language habit of Taiwan dialect. In Taiwanese, the pronunciation of "father" and "mother" may be vague or simplified, so it is common for people to use "father and mother" as titles.

In a word, this name may be caused by many factors. In different occasions and cultures, this title may have different interpretations.