Why is it for adults and south texas to speak both english and spanish?
a. it is required by law
b. it makes it easier to find a job
c. bilingual people make more money
d. it makes it easier for parents to their kids with their homework

why have schools in families in the spanish-speaking world historically include classes in manners?
athey do not have time to teach their children at home.
b) they do not have the money to teach their children at home
c) they want to train their children to live in other countries

Why is it helpful for adults and South Texas to speak both English and Spanish?
   B. It makes it easier to find a job. 
The reason why both English and Spanish must be spoken is because, in an English-speaking country, it is necessary to be able to carry out any activity, where people live or work with English speakers, and as Latin Americans already speak Spanish for their families, then the English language is required to work, live, communicate.   
   C) They want to train their children to live in other countries.
People recognize that even in countries where English is not the official language, if you intend to travel or study abroad, English is the preferred language to communicate; in addition many important schools are in English speaking countries, like United States and England; in Asia, Europe and Africa, speaking English allows you to communicate equally.