Child of a player not syncing position with network?

There is a player object that is syncing position with the server quite well but the child "attack" is not syncing with the other clients. I tried making the attack have its own networking animation component that is controlled by the player but still no good results. Also I tried another way by having the attack move with code alone but again it is not working properly. I would appreciate any help to answer these few questions.

1. Is there a way to have a child of a player sync position either by code or use of the new networking scripts?

2. Does anyone know a good place to look for solutions for the current networking system?

3. At this point, would you still use the previous version of networking over the new networking given that there are more questions that have been given answers?

I have been trying to do research on this issue but I am having a hard time finding the answer since every time I look up "networking 5" I find old network scripts/solutions.