AIBU to prioritise supporting my teens over funding my mum’s rent?

I suspect we have a different definition of 'struggle'.

I'm retired and 90k in savings is an absolute fortune for me.

She can fund herself to begin with. When it runs out she could apply for housing benefit. Though in an ideal world she would plan accordingly and rent a cheaper place within her means

She's not struggling by the sounds of it.

She's choosing to work - great.
Her partner is choosing not to work - fine he's got inheritance
She has savings - fantastic
They can support each other.
If they can't they can move, claim benefits etc.

Your mum is not your responsibility with almost £100,000 in the bank!

Why should you responsible for a working age male who has chosen to not work?

I have every sympathy for elderly parents of both ork, live in affordable accommodation,

Option E is :
they move somewhere cheaper, they both work until 75 and any contribution you make is matched by the chikdren of your mum’s partner!! Or is that not the way they think they are going to be financed.

Will she also be drawing a works pension? She will have been in receipt of State Pension for the last 8 years hence the savings but is there another income due when/if she retires? In the event of her death would her partner be able to afford the rent and similarly if he were to die would she get any money he has?

Your DC are financially dependent on you until they are in employment. Your DM is not Your dependent.
Your redundancy is a compensation payment for the loss of your employment.
You should claim UC or ESA for yourself while you are unemployed. By submitting a claim then your national insurance contributions continue to be paid.

Are you sure you’re that much better off? Bearing in mind she has 90k - 90 k is a lot!

Not your responsibility, it's on her and her partner to fund their life. Yanbu do not support your mum and her partner financially.

If your mum hasn't said anything, how has it become apparent that you are expected to sub her rent? If she has been dropping hints then you need to knock it on the head asap.
"So Mum, if you won't move, how do you plan to pay your rent when you retire? Because obvs I won't be able to help, I have children to support."

Look, she's not struggling now if she's got nearly £100K in the bank! A lot of pensioners don't have £100 in the bank. I would just keep asking how she's going to fund things and look shocked if your name crops up.

How exactly did it become apparent that you are expected to subsidise rent? And once it became apparent, why isn't you set the record straight?

If my mum was single and struggling, I would absolutely help her in any way I could (not that she would ever think of asking me and also I don't have any dependents) but my mum also has a partner and, as much as I love him, I certainly would not be in any way inclined to finance him as well.

He won't draw state pension for 4 more years and depending on his employment record that might not be the full pension (12.5k). How did they think the rent would be paid or is there an expectation of payment? He got an inheritance. How much was it, how much is left?

You're a fool if you pay her rent

She will have to if the money runs out.

Don’t overthink this. She has a partner. They need to sort this out between them. I can’t imagine assuming my DS would need to bail me out because I’d rather not move.

This is absolute madness. Of course you shouldn’t have to financially support her.

Shes an adult, she not living alone, she’s had her whole life to think about retirement and she has 90k in savings! If she can’t see things working out financially she needs to down size, simple.

You need to be putting your family unit first, 100%.

Oh, so she won't entertain the idea of a move...

If she thinks you are going to fund her lifestyle, she's got another think coming then, hasn't she?

Quite!

Option A - use the savings. That's exactly what they're there for.
Option B- the partner covers the shortfall.
Option C - they move to a cheaper property.

Where on earth has Option D - you become responsible for your DM AND the partners idyllic lifestyle, come from??
Has your DM suggested this should be the case?

It's not like you're paying for a care home.
I don't think this should even be a concern for you right now.

She’s got £90k to cover her rent? Why would it fall to you? In the event that all runs out she may be able to claim UC to cover rent. It’s absolutely not your problem to supplement here, she has plenty of money. Your children are your priority.

With £90,000 your DM could buy a retirement apartment outright (and I am in the south of England!). Why continue to pay rent when you can afford to buy? I think she needs to be realistic.

Of course you aren't responsible for your dm's rent. . Your responsibilities are to your dc and them alone..

It is absolutely NOT your responsibility to pay your mum's rent. She can jog on. If it gets to the point where they are short of money, they will have to downsize to somewhere cheaper or apply for benefits. Not your problem.