In this paper, we give a new method to classify all simple cuspidal modules for the
$\mathbb {Z}$
-graded and
$1/2\mathbb {Z}$
-graded Ovsienko–Roger superalgebras. Using this result, we classify all simple Harish–Chandra modules over some related Lie superalgebras, including the
$N=1$
BMS
$_3$
superalgebra, the super
$W(2,2)$
, etc.