A deck of cards is an inexpensive way to have fun with your kids, and it is good for their developing brains. Card games provide social interaction and practice listening, taking turns and handling competition. Most card games promote memorization, matching, math skills, and pattern recognition as well as teaching strategy and probability.
The most important benefit is that a few rounds of Crazy Eights, Memory, Go Fish or Rummy offer a way for parents and kids to play and have fun together, and this strengthens your family relationships.