let me say at the open that I'm a Tarzan fan and like all the Weismuller movies in particular. Johnny Sheffield was great in this movie, his acting was impressively natural. His relationship with his "parents" Tarzan and Jane seemed real and unforced. He acted just the way you would imagine a kid would act growing up in the jungle with Tarzan That part of the movie I liked.
The problem I had was with the tacked on confrontation between Tarzan and Boy's relatives. It was awkward and the villains weren't really worthy of testing Tarzan's mettle. They were unimaginitive cardboard characters and the plot revolving around them was grade A hack material. The greedy grasping relatives seemed so bland and uninspired compared to the relationship between Tarzan, Jane and Boy. I would have liked to have seen something that re-inforced the relationship between Boy and his parents. In closing, the parts with Boy, Tarzan and Jane are great. A boy couldn't hope for a better life than growing up in the jungle with Tarz. The rest of the movie though is a flop. it's worth watching, just stay near the fast forward button on the remote.