I read Don Felder's autobiography which went into big detail on his time as one of the Eagles. Started as a session musician, they then formed a company that split the money 5 ways including him. He was a full member. This was in the mid-70s.They did this a couple more times as folk left and joined.
When they re-formed in the 90s, they formed another new company that gave more money to Glenn Frey and Don Henley (as they were the famous ones, the songwriters and had had solo careers) and less to Felder, Timothy Schmidt and Joe Walsh. Felder was told to take it or leave it, and he took it. Made huge amounts of cash but felt it was unfair. Kept complaining that the money wasn't being split evenly, and in 2001 they sacked him from the band.
It's an excellent read, his book. @WhiteRoseKillie recommended it to me, if I remember correctly.
Back on topic, Felder admitted that in the 70s he was shagging about behind his wife's back whilst she stayed at home and raised the kids. Then, when his career hit the skids and she was becoming successful in hers, and she cheated on him once, he left her.