Family gifts

[hondauk]

Some 46 years ago I bought my first Rolex (an explorer) about ten years ago I bought my wife a lady datejust. I bought my son and daughter in-law a Rolex each as a wedding gift. I bought my daughter a George Jenson (her choice I don't know where i went wrong) and son in-law a Datejust. Now the big question I have three grand children there may be a fourth in a couple of years time. What I'm thinking of doing is buying a watch the year of their birth and giving them on their 18th birthday if I'm still living. I've given this a lot of thought lately but I don't know which watches to choose. Perhaps a datejust for the boys and an air king or midsize for the girls.
What do you all think of this idea.
They won't forget grandpa will they!