Gibo to no Yuuwaku Doukyo Seikatsu ~Tsuma no Haha wa, Gibo to wa Yobenai Bijukujo Deshita~ The Motion Anime

The main character met Remy when he was dead drunk. They had a quick romance and soon got married after the heroine's pregnancy was discovered. After the birth of the child, their life became measured and incredibly calm. To help with childcare, Remy's mother - Shino-san - came. After some more time, Remy ended up in the hospital with the child, and our hero was left alone with the very attractive milf Shino...