ana figueroa , mother of nicholas figueroa , 23 , set up memorial to her son who died in the march 26 explosion on new york city 's second avenue .
blast , which killed two , thought to be the result of illegal gas tapping .
the grieving mother said that neither the landlord of the demolished buildings , mayor bill de blasio nor con edison have contacted her .
family has built memorial , plans to push for small park in memory of son .