(a) A person commits the offense of permanent detention or restraint if, without consent and without lawful authority, the person restrains a person with the purpose of holding or concealing the other person:
(1) Without ever releasing the other person; or
(2) Without ever returning the other person to the person or institution from whose lawful custody the other person was taken.
(b)
(1) Permanent detention or restraint is a Class B felony.
(2) However, permanent detention or restraint is a Class D felony if the person detained or restrained is the child of the defendant.