Full Episode : newtvshowsonline.com Air Date: 2/28/2012 Summary:The family gather to celebrate a big event in the Season 3 finale Julia and Joel try to recover from the stress of the adoption process Crosby and Adam make a decision about the Luncheonette and Sarah comes to a conclusion about her future Parenthood Season 3 Episode 18 – My Brothers Wedding Parenthood ,Season 3,Episode 18,My Brothers Wedding,Parenthood My Brothers Wedding,3,18,3X18,S3X18,SE3E18,Parenthood 3X18,Ep18,Parenthood S3E18