I was reborn as the 3 main characters father ?!

Sara was a poor young man who felt like he chose the wrong paths in life. When he turned 26, he took his own life in his lonely apartment. When he opened his eyes again, he was in front of a young man with elf ears. The young man told him that he was gods messenger and seemed to know sara from somewhere. Sara was told that he could be reincarnated into an otome game that was popular on earth at the time. He would be reincarnated into the Uncle of The heroine and Adopted father of the Villain and Male lead. The original was just a back ground character so he wouldn't have to get involved with the plot. Sara accepted because he wanted a peaceful life for once. The young Elf told him that he could call for him whenever he needed anything or if he just wanted to talk. Then Sara was reborn as a baby and lived his life with his family. He had a peaceful life until he turned 25 years old when his older brother passed away from an accident and the heroine came his house and started living with him. Now if that was all than it would be fine. The Heroine was a sweet and kind girl and it was easy to take care of her but then The male lead and the villain ( who were half brothers ) got put under his responsibility too. The two boys were rowdy and clingy and influenced The heroine to be like that too. All sara wanted was a peaceful and quiet life!! now he has to take care of 3 clingy children who never want to leave his side!! What's he supposed to do now?