Signing is a wonderful skill, as wonderful as speaking another language. Of course I hope your granddaughter never loses her hearing, but even if she doesn't, you may someday come across someone who needs help and can only communicate by signing. When I taught elementary school every morning my class and I would sign the alphabet, but that would be a tedious way to communicate. I know a few other signs, too, mostly because they are used in children's songs! You probably know that the sign languages used in the US and UK are different. I had read somewhere that because of a genetic disorder, many people on the island of Martha's Vineyard off the Massachusetts coast were once hearing impaired, so most people on the island, hearing and non-hearing, could use sign language. This is no longer the case. I always assumed they used American Sign Language, but I read recently that the island people had developed their own sign language. I can't be sure that's true, though.