In The Hobbit, we are introduced to Beorn, the Skin-Changer. However, it appears he is alone in Wilderland. In The Lord of the Rings (appendices I think) we are given information about Grimbeorn, Beorn’s son, and there seems to be talk of a race of skin-changers.
Are there multiple skin-changers? When was Beorn born? Who is Grimbeorn’s mother?
I’d really appreciate any information about the Beornings.