Parents income for widowed parent living with a new partner.

Having a dilemma in that my Mother is a widow and has been for over 9 years. For that last 4/5 year's we have been living as a combined 'family' with her new partner.

When entering parent's income for the student living costs loan calculation, do I just enter my Mother's income or the combined income of her and her partner?

Thanks in advance.

It's the latter.
From their website, one of the options is "one of your parents and their partner, if you’re under 25 and live with them or depend on them financially".