Sometimes the simplest sentiments mean the most. On Grandparents Day and every day, let them know how much you love them. No one ever gets tired of hearing those three little words.

Parents usually handle most of the dirty work when it comes to raising kids, while grandparents swoop in for the fun stuff. Whether your grandma always whips up your favorite meal or your granddad never fails to pull out his checkbook on your birthday, make sure to let them know how grateful you are for their love and support.

If you can't spend as much time together as you'd like, remind your grandparents that they're not "out of sight, out of mind." Tell them how much you miss them when you're apart.

It's so easy to get wrapped up in your own life and feel like you have no time or energy to make plans. But the sad truth is that grandparents don't stick around forever, and you need to spend time with them while you can. The best gift you can give them (and yourself, too) is quality time together, and what better day to nail down plans than Grandparents Day?

No matter how grown up you are now, you'll probably always be a child in grandma's eyes. Share some of the ways she made your childhood special and how much those memories mean to you.

Living to a ripe old age and raising a loving family is an accomplishment in and of itself, and there were probably some obstacles along the way. Tell your grandparents how inspired you are by the challenges they've dealt with in life and how they've helped you overcome your own.

So many of us wouldn't be where we are today without our grandparents. Whether your grandpa worked multiple jobs to support the family or your grandmother spends her retirement helping to bring up the next generation, let them know how their sacrifices have helped you achieve your dreams.

If you've got kids of your own now, you might realize that some of your parenting style is linked to your grandparents. If your grandma's patience inspires you to stay calm when your toddler is melting down or your grandpa's sense of humor has helped you make fun memories, they'll be incredibly flattered to hear the ways that you try to emulate them.

Getting older isn't easy. It might be getting tougher for your granddad to tackle chores around the house or for your grandma to make it to the grocery store. Make sure they know they can count on you when they need a helping hand.

You've probably heard your grandparents say they're proud of you a couple million times in your life, but have you ever said it back to them? Let them know how you always brag about having the best grandparents ever.

You could buy a silly "World's Greatest Grandma" t-shirt or a "#1 Grandpa" mug to let them know how you feel, or you could save your cash and say it with real feeling in a card. Let them know that you wouldn't trade them for the world and that you know just how lucky you are to have them in your life.

They say imitation is the sincerest form of flattery, so imagine how thrilled your grandparents will be to hear how much you admire their lives. Tell them how you're following in their footsteps and how they're your #lifegoals.

Grandparents have so much knowledge to impart to younger generations, whether it's something as complicated as raising a large family on a small budget or as simple as how to bake the perfect cake. Let them know that you've been listening and learning from their example and their legacy will live on through you.