Musical Gifts

• Putting together a music-theme gift for your teen and her significant other will show that you care about your daughter's interests and support the relationship. You can purchase matching iPods for her and her boyfriend, and download a few popular songs that both enjoy. You can also present the couple with some iPod gift cards so they can download more of their favorite tunes, and include a card congratulating the two on their anniversary.
  
  

Anniversary Celebration

• You can put together a party celebrating the anniversary of your teen son and his girlfriend. Invite your teens' friends and family members to your home for the party, or arrange to have the celebration at a restaurant where the couple dine often. Put together heartfelt items to give your son and his girlfriend, such as a memory book that includes photos of the couple at different times in their relationship. Present a cake to the young couple, and take plenty of pictures to add to the book to capture yet another fond memory in the relationship.
  
  

Date Night

• If you're a particularly close family or your teen is fairly young, you can create a date night at your home in which the family can participate to celebrate your teenager's anniversary. For instance, you can set up a table outside, complete with a centerpiece, formal dinnerware and candles. One of your teen's siblings can act as the waiter or waitress and take the couple's drink and meal orders -- after your teen and her date have taken a look at the menu you've provided. If you have a family member who is musically inclined, the loved one can supply live music during the anniversary dinner. Put a digital camera on the table so your daughter and her boyfriend can take candid shots at dinner to make their anniversary even more memorable.
  
  

Favorite Things Gifts

• A gift basket for your teen son and his girlfriend is a gift collection that could serve as a future keepsake. For instance, if your son loves sports, you can include a framed photo of him and his girlfriend at a game. If his girlfriend has a favorite TV show that she often watches at your home, include a DVD of the full season of the show. Food gifts, such as the couple's favorite snacks or candies, are also welcome treats, along with a card wishing the young couple well.