In novel walking to the moon Why would Sal's Dad not trust Gram and Gramp to behave on their journey?

they are kind of wild and do things their own way.

Explanation:

In reality, unless it’s in the communication sector, most jobs don’t require good grammar. You can be an excellent quantitative analyst without “good grammar,” for example. 

Perfectly qualified college applicants are rejected because of bad grammar. This is yet another way of keeping poorer people from receiving the education necessary for social mobility, thus perpetuating a classist system

Besides, the idea that “good grammar” should be expected of everyone relies on a standardized kind of English that does not include language varieties such as African American Vernacular English, for example. 

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