My kids are bilingual – truly bilingual. You must be thinking, “Hey, most of us could speak more than one language. What’s the difference?” You’re right. We’re all bilingual or multilingual in one way or another.
What I mean by truly bilingual is they are not spoken or taught one language at a time at home. But simultaneously (English and German) since they were born. I myself speak four languages, but I learned them throughout my life and I still do. However, I was brought up speaking only English.