M: mother
F: father
g1,g2: girls
b1,b2: boys
C: cop
P: prisoner

CP  ->
C   <-
Cg1 ->
CP  <-
Mg2 ->
M   <-
MF  ->
F   <-
CP  ->
M   <-
MF  ->
F   <-
Fb1 ->
CP  <-
Cb2 ->
C   <-
CP  ->