Why Three Generations Matter

A single-generation snapshot of your health tells only part of the story. When clinicians can see patterns across three generations — you, your parents, and your grandparents — they gain a much richer picture of which conditions may run in your family and how strongly they cluster. Conditions such as heart disease, certain cancers, type 2 diabetes, and stroke often have both genetic and shared-environment components that become visible only when a family pattern emerges.

This checklist is designed to help you gather and organise that information systematically before your next appointment. You do not need a medical background to complete it. Think of yourself as a family health historian: your job is to collect facts, note gaps, and let your doctor interpret what the pattern may mean for your care.

If you are unsure where to start with conversations, our guide to key questions for family health history conversations can help you approach relatives thoughtfully. For a broader walkthrough of the gathering process, see Collecting Your Family Health History: A Step-by-Step Approach.

This Is Not a Diagnostic Tool

A family health portrait identifies patterns that may be worth discussing with a clinician — it does not diagnose any condition or confirm that you will develop any disease. Genetic risk is one factor among many, and most conditions involve a complex interplay of genes, lifestyle, and environment. Always bring your completed portrait to a qualified healthcare professional, such as your primary care physician or a genetic counsellor, for interpretation and personalised guidance.

Tools You Will Need

Before working through the checklist, gather the following resources. You do not need all of them — use what is available to you.

Required

Blank family tree template or notebook

Provides a visual structure to map relatives and their health information across three generations.

Optional

Old family documents or obituaries

Obituaries and old medical paperwork often contain cause-of-death details that relatives may not recall accurately.

Optional

My Family Health Portrait (CDC tool)

A free, publicly available web tool from the U.S. Centers for Disease Control and Prevention designed specifically for collecting and organizing family health history.

Required

Contact list of willing relatives

Identify one or two older relatives — often aunts, uncles, or a family historian — who are most likely to remember medical details about previous generations.

The Three-Generation Checklist

Work through each group below. Record what you know, note what is unknown, and flag items where information is uncertain. A partial record is far better than none.

Your Own Health Record

List all chronic conditions you have been diagnosed with, including the approximate year of diagnosis. Must
Record any surgeries, significant hospitalizations, or major health events. Must
Note current medications and the conditions they treat. Should
Document any known genetic test results or hereditary condition diagnoses you have received. Must

Parents (Both Sides)

Record each parent's major diagnoses, including the age at which each condition was first identified. Must
Note cause and age of death for any deceased parent; if unknown, record that explicitly. Must
Ask about or record any conditions that appeared before age 50, as early onset often carries stronger hereditary weight. Must
Note whether either parent underwent genetic counselling or testing. Should

Grandparents (All Four Lines)

Record known diagnoses for each grandparent, noting which side of the family they represent (maternal or paternal). Must
Document cause and approximate age of death where known. Must
Note any conditions that recurred across multiple grandparents, as patterns across both sides are clinically significant. Should
If grandparents immigrated from another country, note the region of origin, as certain genetic variants are more prevalent in specific populations. Nice to have

Condition-Specific Details to Capture

For any cancer diagnosis in the family, record the specific cancer type, the age at diagnosis, and whether the affected relative had genetic testing. Must
For cardiovascular conditions (heart attack, stroke, heart failure), note the age at first event — events before age 55 in men or 65 in women are considered early onset. Must
Record any family history of type 2 diabetes, noting age at diagnosis and whether insulin was required. Should
Note any known autoimmune conditions (such as rheumatoid arthritis, lupus, or thyroid disease) on either side of the family. Should
Flag any relatives diagnosed with dementia or Alzheimer's disease, including approximate age of onset. Should
Record any known mental health diagnoses if family members have shared that information voluntarily. Nice to have

Missing Information Is Normal — Don't Stop

Many people find that records for grandparents are incomplete, especially if they lived in another country or died decades ago. Do not let gaps stall the process. Record "unknown" clearly alongside what you do know. Clinicians are trained to work with partial histories, and even incomplete patterns can meaningfully guide screening decisions. See our article on building a health history with incomplete information for practical strategies.

Once your portrait is complete, the logical next step is bringing it to your care team. Our article on sharing your family health history with your doctor walks you through how to present this information so it directly shapes your screenings and prevention plan. For guidance on passing this record on to your own adult children, explore sharing family health information across generations.

This article is for general informational and educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for guidance specific to your health situation.