Seems the opposite of how I was raised. My Dad was always smiling, always goofing around. Although early pictures of him do show a rather serious young man. I guess you learn to smile during your life. Or you learn to forget.
Dad, at the cottages in Wellfleet:
Here's another shot of Grandpa, again smiling. Or almost:
Here's a little Christmas in June, with a pretty reticent-looking Santa. I don't remember this, so it must have been when I was very little: