Sharing is caring! It's not always easy getting kids to let other people -- especially younger siblings! -- play with their toys. But Vanessa Lachey and husband Nick Lachey are determined to instill a sense of generosity and unselfishness in their kids.

"One thing that Nick and I love doing is teaching Camden social skills," the Truth Be Told actress tells Us Weekly of her son, who turned 3 on Sept. 12.

The couple, married since 2011, have an easy little trick for getting Camden to share with his baby sister Brooklyn, 9 months. Watch the video above to find out what it is!

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics, and more delivered straight to your inbox!