There is not statute of limitations for kidnapping or murder in Canada, The United States, or in international law.

The Criminal Code of Canada creates two distinct offences of child
abduction, namely abduction in contravention of a custody order and
abduction where there is no custody order. It is an offence under section
250.1 of the Code for a parent, guardn or person having the hawful charge
...

There is not statute of limitations for kidnapping or murder in Canada, The United States, or in international law.

The Criminal Code of Canada creates two distinct offences of child
abduction, namely abduction in contravention of a custody order and
abduction where there is no custody order. It is an offence under section
250.1 of the Code for a parent, guardn or person having the hawful charge
of a person under the age of fourteen to take, entice away, conceal, detain,
receive or harbour that person, in contravention of the custody provisions of
a custody order in relation to that person made by a court anywhere in
Canada with intent to deprive a parent etc of the possession of that person.
Under section 250.2(1) of the Code it is an offence for a parent, guardian or
person having the lawful charge of a person under the age of fourteen to
take, entice away, conceal, detain, receive or harbour that person, in relation
to whom no custody order has been made by a court anywhere in Canada,
with intent to deprive a parent etc of the possession of that person. It is a
defence if an abducting parent can establish that the taking of the child was
done with the consent of the other parent having lawful possession, care or
charge of the child (s 250.3), or that it ’was necessary" to protect the young
person from danger or imminent harm’: section 250o4o It is expressly stated
that it is no defence to show that the young person ’consented to or
uggested any conduct of the accused’ (s 250.5). No proceedings under
section 250.2(1) may be commenced without the consent of the Attorney-
General or counsel instructed by him/her for that purpose. Penalties for
contravening sections 250.1 or 250.2(1) are in either case a maximum
imprisonment of ten years on conviction on indictment.

I am not a lawyer and good for me for that. I have had some college law.