[Avodah] Aveilus and adoptive parents

[rebshrink at aol.com]

According to the position that one can or should observe Aveilus for 
adoptive parents, does the Aveil in shiva take precedence as the 
Shaliach Tzibbur to an Aveil in Sheloshim for biological parents? To 
generalize, what are the policies of who takes precedence as a Shaliach 
Tzibur in all the dovening areas in the case of an adopted child 
observing Aveilus for his adopting parents?

Kol Tuv,

Stu Grant