In general, from header we can call child tags. Why don't you rename the group name of SHIP_TO_CONTACT in child group with some other name?
Or else, if you are in child group and want to fetch the parent details then you can use like <?../../SHIP_TO_CONTACT?> (which means fetch the data from one step above group)
Thanks Bommi, unfortunately I cannot rename in the child group.
Can you give the exact syntax?