After Thrandruil's wife died, Thrandruil became bitter and distant, and as Legolas grew up they drifted further and further apart. By the time Legolas came of age (50 years old), Thrandruil and Legolas didn't have a good relationship. Thrandruil still loved Legolas, though he had a strange way of showing it.
I always wonder what it was like when Legolas was a baby. When it was just him and Thrandruil. So I looked it up. The pictures are funny, adorable, and heartbreaking; but here are some pictures of what it was probably like when Legolas was a child.