Screwing my mum over or..?

[portobella]

My younger sister is at uni. My mum has paid for her private education all her life until she was 18 (stayed back in school..) then college for nursing 2 years also private, now uni for 3 years.. She is in her 2nd year now. ( I am fully supported this in not about me but back story to her)

She has moved from abroad to the UK for uni. She has been there 3 years my mum has paid for everything housing, food, fees, etc etc..

The first year she failed citing move to UK was stressful.. didn't go to placement and hadn't been fourth coming about anything..

Took almost a year off to adjust and now in 2nd year half way through she's telling me she's on the same assignment she told me she was on at christmas.. She took a large student loan and didn't tell my mum.. no-one seems to know how she is gettign on.. Corona hit and was supposed to study from home.. but there is no progress..

Fast forward and she has let slip that she dpesnt have enough for her fees - my mum pays it into her bank account - why does she not have enough? She is supposed to have started back this morning at placement and is still in bed (also have a person in the house that has said she said "ignore the fact I am here.. don't tell anyone.." and she has been having booty calls with a very malnourished looking guy 3am in the mornings etc..she has also been out to see him) She is a "Big" girl he is a "very skinny" small guy that only turns up at godforsaken hours and she met him on a dating site.. (all is well with the big person/ small person thing, but something doesn't feel right) Could she be giving him money??

She has claimed she has fear of leaving the house - but she booty calls a guy so don't fricking think so..

Now my massive issue above and beyond the fact I think my sister is taking the **SS with my mum is that my mum has been diagnosed with Stage 3 cancer - just had her op and is due her chemo to start in a week (8 months worth) she has had to go private (she lives abroad where there is no NHS) and has used most of her savings - she is alone and has no help.

Now there is more back ground here, but the basics are as above - do I tell my mum..?? and stress her with this or no?

AIBU - no don't
AINBU - yes of course you should

Yabu,don't tell your mum.
Allow her to concentrate on herself and not fret about her dd.
has your ds been told about your mum?if not tell her but advise her to keep her financial woes to hetself.
What she may be doing with her alleged booty call is her business.
I really hope your mum pulls through op.

Thing is.. - my mum woke me up at 6 am this morning to make sure she was up to go to placement - she's super concerned so isn't letting it drop. My sister knows she has cancer - and I've just been informed she is going off on a three-day trip to see a boy she doesn't even know.