How to solve the contradiction of brother-sister love?

Young man, your sister is divorced, introverted, highly educated, and will look at the problem from a different angle and depth than the average person. She loves cleanliness and neatness and is a perfectionist. It is difficult to communicate with people. Living with two women, brother and daughter-in-law, increases the difficulty of harmony, but even living under the same roof, she can't afford a house, and renting a house will intensify the contradiction between aunt and daughter-in-law. Then, you will live under the same roof. I advise my sister and daughter-in-law to take a step back, even a small step, adjust their relationship, gradually change each other's personality, be tolerant and open-minded, and the relationship between the two sisters will be coordinated.