A one-of-a-kind adoption proceeding will take place in a Cook County courtroom on Friday as a brother and sister become cousins when they are separately adopted by two adult sisters.

The 5-year-old boy and 8-year-old girl are two of the seven children whose adoptions will be finalized at 10 a.m. on Friday in Courtroom 1707 of the Richard J. Daley Center, 50 W. Washington St.