If pronouns of different persons are to be used together in a sentence, the serial order of persons
should be as follows;
second person (2) + third (3)+ first person(1) in normal sentences.
Ex : You, he and I have finished the work.

But when mistake or fault is expressed in the sentence,the order should be;
first person (1) + second person (2) + third person (3).
Ex : I, you and he are to blame