Xiaotian is Xiaowen's brother, and Xiaowen is Xiaoyi's sister. Xiaoyi is the grandson of Xiaotian's father, so what is the relationship between Xiao Tian and Xiaoyi?

There must be brothers and sisters here who are not relatives. Otherwise, the relationship is wrong.

According to Xiaowen's brother, Xiaowen is Xiaoyi's sister, so he and Xiaoyi are peers. As for who is older, it is not clear.

According to Xiao Yi, the grandson of Xiaotian's father, they are nephews and uncles. Even the relationship between the son and the father.

When two relationships are mixed together, there must be a distant one, so far is not counted, but near is counted.