Proving Sole Parental Responsibility

[Leanne08]

Hi
I'm planning to move to the UK to be with my UK Citizen fiance. I have UK Citizenship by descent. I have a 12 year old son who I want to get a visa for. I have court orders clearly stating that I have sole parental responsibility and that he will live with me in the UK. I got the orders to satisfy the Hague Convention around child abduction. I also have a Statutory Declaration that I have made outlining the history of the relationship between me and the father including that the father does not pay child support, that I have made all the decisions for my son since he was 1 year old. I have letters from my son's primary and secondary schools as well as Dr's stating that I am the one that has attended all the appointments and made all the decisions for my son's education and medical needs.

Is there anything else that I can provide to prove I have sole parental responsibility. The father is not willing to sign a stat dec as that is too much effort and he has signed the court orders to agree that I have sole parental responsibility and that my son can live with me in the UK.

Also which visa do I apply for as all I can see is the one that is for UK Citizens already living in the UK. My fiance will be financially supporting us so is it a good idea to get a letter from him as well?

Thanks

[CR001]

Sole rep documents should be ok.

You have to apply for a child settlement visa.

https://www.gov.uk/uk-family-visa/child

Have you ever lived in the UK as a British citizen with evidence to prove it?