DS - 156 filling

[rajinims]

In question 18 its said Spouse's full name. My mom is widowed, should we fill my father's name or fill "none". And i don't know the exact month and date of my father's DOB, only know the year. So what should i do?

Thanks

[immihelp]

Irrespective of your mather's marital status, write whatever your mother's full name is.