I try to maintain a family tradition by sending valentines to my grandchildren. My children used to get valentines from my parents, and kids always enjoy getting something in the mail. If I had more time and were a little craftier, I would make hand-crafted valentines.
Another fine way to send Valentine's Day greetings is with an e-card. Jacquie Lawson has the most beautiful animated cards I've seen, set to classical-type music. They are especially appropriate for friends and significant others as well as for older grandchildren. Her e-cards aren't free, but she's a wonderful success story, an artist who created her first e-card 10 years ago and has turned her talent into a cottage industry, appropriate since she lives in an English cottage.
If you want free e-cards, check this list of family-friendly e-card sites. I found my current favorite Valentine's Day e-card on the Blue Mountain site, which has both free cards and a membership program. If you're sending to older grandchildren, you need to know that most tweens and teens have ditched email in favor of texting. You can now send an e-card to a cell phone, from Hallmark as well as other companies, so you might want to investigate that strategy. If you send an e-card via email, you'll need to follow it up with a text alerting your grandchild to check email. You do know how to text, don't you? If not, it's time you learned!