Sec. 135.15  Unlawful imprisonment; defense.
    In  any  prosecution  for  unlawful  imprisonment,  it  is an
affirmative defense that (a) the person restrained  was  a  child
less than sixteen years old, and (b) the defendant was a relative
of such child, and  (c) his sole purpose was to assume control of
such child.
.

(For verification consult Official Text at Senate Gopher site.)