Do I need to give him a plane ticket to travel with my sister-in-law

Sister-in-law and herself are family, and they are closely related. In order to avoid conflict, we need to give each other plane tickets, and helping each other can make our feelings better.

If family members don't blame each other, be more tolerant and understanding, don't care about right and wrong, they can make things simple. Not blaming easily can create a loving family atmosphere.