Divorces are hard for everyone in the family, not just the couple who is separating. Divorces have an effect on parents, grandparents, children, aunts and uncles. Others may be affected by the decision as well, worrying about how the separation could affect their friendships or social circles.
As someone who is friends with your in-laws and spouse despite the decision to divorce, you may be able to maintain those relationships. However, don't be surprised if people seem like they choose sides. In this scenario, people, especially friends and relatives, may feel that they need to side with their loved ones or those they feel closest to.