to which anyone can relate 
(ROOT (SBAR (WHPP (IN to) (WHNP (WDT which))) (S (NP (NN anyone)) (VP (MD can) (VP (VB relate))))))
(ROOT (SBAR (WHPP (IN ) (WHNP (WDT ))) (S (NP (NN )) (VP (MD ) (VP (VB ))))))