One of the listed requirements is "Lease or Mortgage contracts showing joint occupancy oof your communal residence"
My house is paid off. The only loan I ever had on this house was a home equity loan that I entered into, two years before my wife arrived (Since paid off) We don't have any joint mortgage/HELOC accounts for the house.
We do have joint bank accounts, I have her as a beneficiary for dental on my employer's dental insurance. She has a separate healthcare plan, but bills to our joint address.
I have several bills that have our mailing address, and she also has paycheck stubs with her mailing address... But recently she stopped working because I got a new job that pays better and overlaps with her previous job's hours (and she needed to be at home to take care of our toddler)
We've also had a kid together, and have birth certificate for the boy.
We have Income Tax returns etc.
We have a lot of photos of us together.
We also may be able to provide medical bills that show us both as parents.
Any other recommendations on what to bring?