How did we learn about sending Valentines?
By giving one to every kid in our class, every year.
We grew up knowing that you could send Valentine's to any and everyone -- not just your "true love." So, of course, it's okay to receive a Valentine from your parents and vice versa. Penpals, cousins, neighbors, facebook folks, old friends, new friends, elders and youngster. Send away!
To your heart's content!