Be aware of coercive controlling family members

When people divorce most people blame the couple getting divorced.

However Divorce is often caused by people outside of the marriage i.e family, brother/sister in-laws, friends etc.

For example a jealous older sister, might hate the fact her younger sister has a much wealtier husband, she will slowly manipulate her younger sister to divorce, so she can feel better about herself.

If you want your marriage to last ensure the person you choose isn't controlled by others.

If that partner is, this will likely be the reason you divorce in future, if they were already controlled by this person, you must very carefully and intelligently distance that person. Otherwise divorce will eventually come because of them.