No, many sibling relationships have happy endings.

When a couple starts a family, age is not an obstacle, the obstacles are psychology and outlook. In real life, there are many divorces not because of age, but because you are older than me and we are not suitable to be together.

There is no definite data that the final divorce rate of sibling relationships is higher than the divorce rate of ordinary marriages. If there is no such data, please do not be biased against sibling relationships.

Human life is too long. It takes a long time to fall in love, get married, and have children. Husband and wife spend the longest time with each other. If they can face life together In all things, if we understand and tolerate each other and never give up, we will definitely have a happy life and grow old together.