A Father in Law and Two Daunghters in Law

Storyline

Tanaka has two sons. After the son and the husband get married, the two daughters-in-law also move into the house to live with the father-in-law. One day, the second daughter-in-law received a notice from her American husband that she wanted to divorce her; the eldest son also told his father about his divorce and left the house. After that, what kind of life will the father-in-law and his two daughters-in-law develop?