Eagles don't live in groups. But you usually see them in a pair. Most eagles have mates for life. But if you see 2 bald eagles and 1 or more golden eagles in the same nest, the golden eagle is probably just a young bald eagle. Lots of people mistake a young bald eagle for a golden eagle.
No. Bald eagles are not very social animals, as they do not live with any eagles besides their mate. The only exception is when migratory populations travel together, as with many bird species. Bald eagles often gather in numbers at food sources, such as salmon runs.