Extended Family

I married early because I got my wife pregnant, and I can't complain about my life since as it has worked out. I wasn't held back due to marrying young, as I wasn't going to university as I wasn't a great student or had any interest in going either. Neither was my wife thinking of university and I followed my father into the building industry. I bought a house on the outskirts of town and done it up over the years. Quite happy with how things were going and already had 2 children my sister-in-law moved in as their parents had passed away due to Covid. Not taking precautions and already having other health problems didn't help them get over the virus. Having my sister-in-law living with us wasn't a problem and my wife was pregnant with our third child. So, we started a regular threesome sexual relationship, as we were in lockdown and bored. By the time the lockdown was removed, my wife was almost ready to give birth and her sister was already pregnant to me. Albeit unknown at the time, after the birth we discovered she was pregnant and let it go at that. Now 2 years later, my wife is pregnant again as is her sister. As far as we're concerned it's our perfect family unit and nobody's else concern.