Mother died from a stroke aged 56. Brother with diabetes.

{
  "resourceType" : "FamilyMemberHistory",
  "id" : "mother",
  "text" : {
    "status" : "generated",
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">Mother died of a stroke aged 56</div>"
  },
  "status" : "completed",
  "patient" : {
    "reference" : "Patient/100",
    "display" : "Peter Patient"
  },
  "relationship" : {
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/v3-RoleCode",
      "code" : "MTH",
      "display" : "mother"
    }]
  },
  "condition" : [{
    "code" : {
      "coding" : [{
        "system" : "http://snomed.info/sct",
        "code" : "371041009",
        "display" : "Embolic Stroke"
      }],
      "text" : "Stroke"
    },
    "onsetAge" : {
      "value" : 56,
      "unit" : "yr",
      "system" : "http://unitsofmeasure.org",
      "code" : "a"
    }
  }]
}