Divorced then Remarried

My wife and I divorced mainly due our careers, always apart. But we separated on good terms and saw each other fairly regularly. I own a small cabin and use it to go skiing in the winter, my ex-wife also loves skiing and she and her sister joined me for a weekends skiing. Not problems with that, except a blizzard came thru dropped so much snow all roads were closed for 3 days. Being stranded in a cabin with 2 women is everyman's dream, even if one is your ex-wife. We started having sex (threesomes) and as a result my ex-wife got pregnant. We took the easy way out and remarried, with a daughter now my wife cut back a bit on her career goals. But her sister lives with us and takes care of our daughter. Her sister is restricted to a wheelchair due to a bad car accident years ago and cannot have children of her own. So, she is a second wife for me you could say, and it seems to be working just fine.