I have supported bilingual children by:
buying bilingual books (now have over 20 and 3 dvds) to share with children. Admittedly I can't read every child's home language, but I can and do read aloud in the languages I learned at school.
using Ebay to find resources like jigsaws and games in their home languages
using internet to find lyrics and singing songs in their home language
writing words and letters from their home language & alphabet when we've played with aquapens etc
learning a few words from every child's home language and using in everyday conversation.
encouraging parents to bring in resources from home to share
Got my report today and Ofsted said "children learning English as an additional language have fewer opportunities to develop and use their home language in their play and learning". Was expecting a more positive comment