2 Solutions…
I spaced the answer way down in case you still want a chance to solve it.
<<<spoilers ahead=“”>>>
F=Father
M=Mother
P=Police
T=Thief
S=Son
D=Daughter
<<<spoilers ahead=“”>>>
PT >> , <
, <<pt, fs=“”>>, <<f, fm=“”>>, <<m, pt=“”>>, <<f, fm=“”>>, <<m, md=“”>>, <<pt, pt=“”>>, <<p, pd=“”>>.
IT also works when the police moves a daughter across first.
PT >> , <</p,></pt,></m,></f,></m,></f,></pt,>
, <<pt, md=“”>>, <<m, fm=“”>>, <<f, pt=“”>>, <<m, fm=“”>>, <<f, fs=“”>>, <<pt, ps=“”>>, <<p, ps=“”>>.</p,></pt,></f,></m,></f,></m,></pt,></spoilers></spoilers>