I am trying to write a letter in russian. I am new to this language.

"...,юлди всё ещё посылают телеграммы своим родственникам друзьям".

What does this mean...my guess is "..their relatives and friends" but I am a little uncertain about the conjugation. Is it because the chain of words is controlled by a feminine noun that in dative and that the reason why the words ends in -им -ам and -ям?