to be related  - conectar, estar relacionado (con), relatar, contar, relacionar, asociar, relacionarse (con), llevarse bien (con) 

to establish a relationship between

to connect  - conectar, enlazar, empalmar, comunicarse, unir, juntar, vincular, relacionar, asociar (ideas) 

to link up  - unirse, conectar 

to be connected  - conectar, enlazar, empalmar, comunicarse, unir, juntar, vincular, relacionar, asociar (ideas)