It is something that depends on the closeness of the relationship between the person but it also takes more skill and practice especially to communicate over long distances ...
in Incarnates transmission of thought requires strengthening to be effective. Strengthening can be by affinity, by urgency, or by authority.
Affinity may be due to kinship; for this may increase the likeness of hröa to hröa, and so of the concerns and modes of thought of the indwelling fëar, kinship is also normally accompanied by love and sympathy. Affinity may come simply from love and friendship, which is likeness or affinity of fëa to fëa.
Urgency is imparted by great need of the "sender" (as in joy, grief or fear); and if these things are in any degree shared by the "receiver" the thought is the clearer received. Authority may also lend force to the thought of one who has a duty towards another, or of any ruler who has a right to issue commands or to seek the truth for the good of others.
These causes may strengthen the thought to pass the veils and reach a recipient mind. But that mind must remain open, and at the least passive. If, being aware that it is addressed, it then closes, no urgency or affinity will enable the sender's thought to enter.
It also requires openess ...so I tend to think that young elves might be more able to communicate between themselves than with their elders - equivalent of human teenagers grunting at their parents but spending aeons on the phone or IM with friends
