I am a permanent US resident (UK citizen) and I am attempting to file the I-130 for my 21 year old son, me and his mother were never married but we lived together for the first 8 years of his life, and I have supported him emotionally and financially through his first 18 years and beyond (the bank of dad never closes) I'm confused as to what evidence I need to provide to demonstrate our relationship and my support of him, the application process is frustratingly vague, is there a template of a statement that I can ask his mother to sign? or any other suggested evidence I can use for the application.
His mother and I had a private arrangement for my financial support of him, therefore it was never formally documented, so in the absence of official documentation would a written statement cover it?
Thanks in advance for any advice.