First of all, how to call this meeting depends on the relationship. In other words, if there is a certain degree of seniority and kinship, it will not be counted by year. If it is a stranger, that is, a person who meets for the first time, the difference between brother and sister is already 17 years old, so it is ok for a woman who is several years older than her brother to call her sister directly, but if she is ten years older than her brother, just call her aunt again, because you and your brother are 17 or 18 years old apart, so,