I recently published a paper on multilingualism. It was fun to write the paper. I thought I would include a couple of the better sources that I found while writing the paper.
There are all kinds of worries out there for teachers and parents. The children don't seem to be worried though. They are bilingual and loving it.
Baker, Colin (2000) A Parents' and Teachers' Guide to Bilingualism, Clevedon: Multilingual Matters LTD.
Tokuhama-Espinosa, Tracy (2001) Raising Multilingual Children: Foreign Langauge Acquisition and Children, Westport: Bergin & Garvey.
Great guides for parents raising multilingual/multicultural children.