In the first, the bride presents a rose to each mother as she enters. 

In the second, the bride and groom each present a rose to their mothers as they exit. 

In the third, the parties give each other a rose, and keep a vessel in their home to place a rose in it each year on their anniversary.  Placing a rose in the vessel can also verbalize "I need to talk," "I love you," "I need you," "Please forgive me," etc.