can be controlled and managed if triggering factors are taken care off.It is not curable bcoz if trigerring factors come,it can come.
Its better to know them to avoid like:
pollen ,dust,smoke odours,perfumes and sprays etc.
sudden change in weather.
laughing or crying loud.
even food preservatives.
Asthma can be inherited if there is family history,but it is matter of chance.So, Donot worry if children will be effected or not..