It all started after a tragedy

I was almost 21 and attending university, I got news of both my parent's death in a car accident. I was totally shocked and very sad at the news, but I'd to pull myself together as the oldest of their two children. My sister almost 18 at the time hadn't been told and I was required to accompany the police officers to be with her when she was informed. Of course, she was devastated by the news and hugged each other for over an hour. I made the funeral arrangements and after the funeral and we were alone as all relatives had returned to their own homes. All told us if we needed any help just call, we were financially well off and stayed close to each other. Several months later, we'd sold the family home, far too many memories for us to keep it. Buying a house close to the university I attended, we started our new lives together. My sister was over 18 and hadn't planned on attending university preferring an art course as she loved to paint. On our break from our studies, we went to a lake to vacation. Renting a cabin on the shore, I explored the area while my sister painted. At the far end of the lake away from almost everybody I saw an island in the lake. Nothing unusual about that as there were several near our rented cabin, but this one was the only one in that area. I could see a roof of a building on the island and as I walked around the shore, I saw a sign near a dock on the lakeshore. It was a for sale sign for the island and I took a photo of the sign and also of the island. I returned to the cabin and while having lunch with my sister, told her of the island. She also was as interested as I was, so after lunch we went and seen the real estate agent for more information. It was the same agent we rented the cabin from, finding out more information and making a time to view the island next morning. We viewed the island and decided to buy it, once purchased we made arrangement to modernize it, and the island came with an acre on the lakeshore where the dock was. It had road access and so we had a lockable double garage and ramp built close by the dock. We'd then returned to our studies while the work was done. Making short trips to check on progress and once it was ready we bought a boat and stored in the garage. Our next break from studies we went to our island, sold and wind power supply with a battery backup and satellite internet and phone connection. As our stay progressed, we decided to just drop our studies. We preferred the lake more than being in the city and had decided to live fulltime at the lake. No real need to work as were well off and had also become lovers during our first stay on the island. None of the local know of our family relationship and as we had always been seen together thought us to be married. Another reason for dropping out of our studies, I'd gotten my sister pregnant as a condom had failed. We didn't know for certain she was pregnant at the time but assumed she would most likely get pregnant. We returned to the city to sell our house and finalize everything that needed doing. Now 8 years later we've 2 children (boys) and another on the way in about 3 months. No health concerns for any of our children including the daughter my sister is carrying now. We haven't regretted our decision ever since we made it and are very happy living a quiet life on and around the lake.