Need some advice and help

[arya_uk]

Hello Seniors,

I am an EU family member residing in the UK for the past 3 years. My spouse isn't working as she is taking care of the child.
Recently I applied for the postgraduate studies in Wales, I have provided the requested documents for fee assessment now the university is asking for providing evidence either being worker/student/self-sufficient, now the question is what evidence should I provide for being self-sufficient?
As per my knowledge is it only bank statement or anything else has to be provided?

Thanks in advance.