I think it is an awesome bonus to grow up in a multi lingual household! My mom speaks rudimentary German from when she lived there as a kid when her dad was in the Army. She took a couple classes as well, but never became fluent. Even so, she exposed me to it from a young age, she'd sing songs in German (said ANYTHING to get me to go to sleep! lol) and hosted a German club once a week after school in elementary school. So by the time I got to high school where I could take it formally, I knew some basics: "My name is..." colours, numbers, etc.
After majoring in it at university and spending a year abroad in Germany, I became pretty fluent (lost some since I haven't used it recently tho...). A lady in the airport a couple years ago overheard me speaking German, and she commented in English - with a heavy German accent - "let me guess, you were raised in America by German parents?" I was tickled to think that my accent was at least that good and I attribute it to having heard many of the sounds early in childhood.

My cousin grew up in a family that spoke Spanish, French and English. Thinking this would work to be a great advantage I asked my uncle how many languages Bobby spoke, I was shocked to find the answer to be One, English. He was adopted and Mexican-Apache ancestry, my uncle said we did not wanting him to speak Mexican and be considered a dumb Mexican. I just about shit my pants, I was in College and needed to learn a foreign language to graduate, he would have had that in spades. I quickly figured my uncle was racist and too bad not as smart as he thought he was.

In Europe the average citizen speaks no less than 3 languages. To say you shouldn’t speak a second language for any reason is counter productive

My former brother-in-law(ex-wife's brother)emmigrated to Stockholm and married a Latvian woman. They have 3 kids who grew up tri-lingual from birth. Dad speaks only English. Grandma, Latvian. Neighbor kids, Swedish.

My grandma started but was short lived

I think you are correct. I had a friend who was bi-lingual and she taught her children as they began to speak. She would say 'cup' in english and repeat 'cup' in spanish. They speak both languages fluently.

My parents were both bi-lingual. They taught my older sister French - but not me.

It doesn't seem to have affected our development in any way differently. She can just order off a French Language menu a bit better than I can. She's lost much of what she did know - even though we both had French throughout school. Her continuously - me for six years.

I wish I had a second language - but it's ok - I'll take what I have.

People were shamed for not knowing English back in the day. Not for having a second language.

I was raised that using a second language in public in front of other people was exceedingly rude - if you had a choice in the matter. My parents insisted we never do that.

The more you learn at a young age the better an adult you developed into..

I completely agree. I lost my momentum learning Spanish, and set it aside. I guess I'll really know how much I learned when I pick it back up.