This is a fun and educational site for children aged 5-12. You could find free online games, songs, stories and activities for children, and also articles on supporting children in learning English for parents.
http://learnenglishkids.britishcouncil.org/en
In the parents' section you'll find lots of expert advice about helping your child learn English. You can search among hundreds of free online English games, songs, stories and activities and find more information on apps for mobile phones and tablets. You can also find out about courses offered at British Council teaching centres.
http://learnenglishkids.britishcouncil.org/en/parents