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Routing under VPN tunnel

Hi All,

          We have  three sites in full meshed MPLS configuration. Site A >>> Site B >> and Site C, they all can reach each other subnets via MPLS. Now, my dilemma is Site C has a LAN-TO-LAN VPN tunnel with our Parent Company. Now i want site A and B to access our Parent company under the same VPN tunnel at site C rather than create a new vpn tunnel from Parent Company to site A and site B(don't want to have 3 tunnel to a single site). So i need a bit of help to make sure that is going work before i start the implementation. There is my plan, please feel free to comment and make suggestions...

1. Have parent Company to add Site B, Site C subnets into their Crypto map ACL;

2. Myself to add routes in site A and site B to send traffic destined to Parent company subnets to site C router and router to send it under VPN tunnel;

3. Add site A, and Site B subnets into the Crypto Map ACL at site C allow and encrypted traffic before sending it to under the tunnel to parent company.

Yes, it does look like that clear for me... but i am still uncerstain and don't want to play with production network, so your  your feedbacks, sugestion, and commets are welcome and will be appreciated.

Thank you all,