From IHE Wiki
Patient Contacts states:
<code code=' ' displayName=' ' codeSystem='2.16.840.1.113883.5.111' codeSystemName='RoleCode'/> The relationship between the patient and the guardian or other contact should be recorded in the <code> element. The code attribute is required and comes from the HL7 PersonalRelationshipRoleType vocabulary. The codeSystem attribute is required and shall be represented exactly as shown above.
However, this template states:
<code code='xx-fatherofbaby' displayName=' ' codeSystem='2.16.840.1.113883.6.96' codeSystemName='SNOMED CT'/> For father of baby the code SHALL be xx-fatherofbaby (requested). The code system name is SNOMED CT
There would appear to be a conflict between the two code systems. Natural Father of Fetus states to use SNOMED, while Patient Contacts states to use HL7 PersonalRelationshipRoleType.