Children of the 90s has recently started enrolling the grandparents of the original children who were born in 1991 and 1992, and we would like to enrol up to 1000 grandparents into the study in their own right.

Having information on three generations of the same family will be an incredibly important resource for scientists around the world. It will help us to examine the importance of lifestyle and genetics on health, and how this is passed through the generations. 

If you are a Children of the 90s grandparent, this is a great opportunity for you to take an active role in one of the world's most important long-term health research projects. By taking part you will be helping us carry out even more research that will potentially lead to benefits in public health. 

All grandparents of the original Children of the 90s children are equally important to us – whether biological or not.

How to enrol

To enrol as a Children of the 90s grandparent please print and complete the Enrolment form (PDF, 14kB). You can complete this form even if you think you may already be enrolled.

Please send your completed forms to or Children of the 90s, Oakfield House, Oakfield Grove, Bristol BS8 2BN.

Further information for grandparents

The study has been going for many years – why do you want to enrol me now?

Children of the 90s began by studying children born in the Avon area between April 1991 and December 1992. A grandchild of yours was one of them. These children and their parents have spent the last two decades helping us with our research. We would like to look at your health and well-being in relation to your children and grandchildren. We can learn a huge amount about the causes of ill health and well-being by looking at different generations of the same family. We have now received funding that will enable us to look into this in detail.

If I sign up, what happens then?

Filling in the enrolment form just gives us permission to contact you or send you mail directly. You will be asked separately about taking part in different areas of the study. All Children of the 90s activities are entirely voluntary. You can do as much or as little as you like. In the next few months we will ask you to fill in a questionnaire and provide us with a saliva (spit) sample, which contains your DNA.

I am not biologically related to either my study grandchild or child – are you still interested in me?

Yes we are. We are equally interested in both biological and non-biological (step) grandparents as all family members have an influence on each other. Health and well-being are affected by many factors, both social and genetic. This means that a step-parent is as important to us as a biological one. We will not be checking whether you are biologically related to your other family members and will rely on you to tell us this. We will not tell other family members anything that you have told us as, all information you give us is confidential.

Will you want my DNA?

In short, yes (if you are happy to give it to us). Your DNA will help us to study how genes affect behaviour and lifestyle, and how this affects the family environment. Your DNA will help us to look at your own health and also at genetic aspects of health within Children of the 90s families. A child’s genes come from both mother and father, so it’s better if we are able to look at both parents and all their children. That’s why studies looking at conditions such as asthma, obesity or diabetes need to look at DNA from all family members.

How can I enrol?

Please fill in an Enrolment form (PDF, 14kB) and send it back to us at Children of the 90s, Oakfield House, Oakfield Grove, Bristol BS8 2BN.

What are the possible disadvantages and benefits of taking part?

There are no real disadvantages of taking part. Nothing is compulsory and you are not committed to take part in any Children of the 90s activities even if you return the completed enrolment form. There will not be any direct benefit to your health by taking part in our research. However you will be playing an important role in developing our understanding of health and disease. The findings from the research could one day benefit future generations.

How confidential will my information be?

The information we collect from you will be stored for use by Children of the 90s and researchers whose research has been approved by the ALSPAC Executive Committee. The research data is labelled with a study number only, so it cannot be linked to you. Your personal details are stored separately and securely. This means you can be sure all your information will be held confidentially, including from the rest of your family.

Will anyone else know that I am taking part?

Any communication between you and the study would be confidential and we will not tell anyone else.

Who has approved this study?

  • The ALSPAC Executive Committee - this is a group of senior researchers and managers who work in Children of the 90s.
  • The ALSPAC Ethics & Law Committee, made up of experts in research ethics and study participants.

What happens if I enrol and then change my mind in the future?

You are free to withdraw at any time. Just let us know and we will make the necessary changes. Your decision will not affect the participation of anyone else in the study. All activities are completely voluntary, you can decide in future about what activities you would like to do.

What plans do you have for the future?

We hope to continue collecting information from you, through questionnaires and possibly even visits to our clinic in Bristol. We will also ask you if you are happy for us to access your official records, such as health and education records.

I have more questions. Who can I ask?

Please contact our Participation Team by phoning 0117 331 0010, or emailing

As the children themselves become parents, the team is expanding the scope of the study to a new generation


Calling all grandparents!

Contact us if you'd like to take part or for more information

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