Ideally you should begin learning a foreign language with your children before you leave your home country. Both you and your children will be better prepared for the initial challenges you will face in your new country and will find it easier to adjust to moving overseas
and settle in faster, if you can attempt conversing in the language of your host country.
Begin by practicing common phrases with your children, use a phrasebook or picture dictionary. Read children's books and comic books in the foreign language, many expat parents find using school books in your new language, which are aimed at four to eight year olds, an excellent aid to getting a basic grasp of the language.
Use this as an opportunity to learn the language alongside your child, if your child hears you speaking the new language, they will be more willing to learn it too.
If you intend staying in your host country for a long period of time, be aware that your children’s language skills may quickly outpace your own. This can lead and frustration with everyday activities such as homework, so it is vital that expat parents be as invested in learning the language of their host country as their children are.