If you are currently making $7-$10k on average, why would you relocate to an foreign country and make less on a monthly base? Also seems like you are married with 2 children. Relocating your family will be more expensive than your first thought because most probably you will have to cover their visa expenses. You all need to get familiar with "aliens".

If I were you I would offer remote service to that company but would not relocate there. If they accept it's a win win. Other wise you can continue freelance.