To think my MIL/FIL should think of themselves?

[GaaaaarlicBread]

Ok so this isn't the sort of thing I would normally ask on a forum, but I need to just say something.

So I have a brilliant relationship with my Mother and Father in law. We are super duper close, they're literally like my parents.
They don't have a lot of disposable income, due to other commitments, other things to pay out for etc.
My DH Auntie/MIL's Sister, passed away suddenly the other night, although she was unwell but didn't expect her to die so quickly. She lives/lived in N Ireland. Got a daughter over there (younger than me), they equally didn't have a lot of money (no money really) due to her ill health she didn't work, and neither does her Daughter.

So MIL has gone over to Ireland with FIL to sort things out, get death certificate etc. They are obviously thinking about their niece who is going to be homeless over there (she is 22) as her Mum had no life insurance, they don't own the house, she has no income herself, and no Dad. Never worked as she has always been there for her mum. So they're having to think about helping her, trying to get social services help and stuff but with it being the weekend they haven't been able to do anything. Now, what they didn't realise (I did but didn't want to say anything at the time as they were in pieces anyway), they have to pay a fee to bring the ashes over (can't afford a funeral either so having her cremated by the council but again there is a fee obviously). They literally cannot afford to do that, and cannot afford to transport the ashes back. DH and I have said they cannot get themselves into any money problems, and DH Father has agreed and wants to come home tomorrow as he originally was because of work, and bring MIL back with him as she was going to stop for a month to figure things out, but equally has to take it as sick leave to do so (unpaid), which again eats into their money. A month of no income is massive for them.
DH and I were thinking of lending them money but FIL is reluctant to take it due to not being able to pay us back and he hates borrowing money. I know to some people £750 isn't a lot, but in this situation it is.

AIBU to agree with FIL that they need to come home and leave the ashes with their niece? What would you do?

If you can gift them the money. Remind them of all the times they've been there for you. Assuming they have. And you value that far more than the monetary worth if the gift.

@PicaK thank you so much for replying. Yes I know, that is what we said but they're really not wanting it. As we paid for their flights before, and their food to take there because there was zero food in the house when they last visited and also their niece cannot cook other than toasting bread. I've helped them a lot, especially when DH was at Uni and they really are amazing, they do help us too with advise etc when we need it, come to hospital apps with me when DH is at work and I need support in clinic etc. It's a tough one.

Would they be able to scatter the ashes where they are? Do they need to bring them back?

Where does the fee for the ashes come from?
When my little brother passed a couple of years ago we took his ashes abroad to my mother's family home to be scattered. I organised everything and all you need is a letter from the crematorium explaining what they are and you can fly with them. You can phone airport security to notify them what you are taking. Security were very respectful of them. There may have been a form on the airline site as well, I can't remember exactly. But I do know that it didn't cost anything to fly them with us.
I'm not sure on the fees for the crematorium but possibly gift them money if you and DH can afford it.

@misunderstoodagain im glad you said that as I’ve just been doing more research and found if they fly with another airline they don’t need to pay then can just carry them in their hand luggage . I’m just waiting for Mother in law to call me back as we are going to pay for what we can and ask them to come back tomorrow and pay for the ashes to be transported over as she can’t afford more time off work to wait for the cremation .

@PrincessRaven her mother is scattered over here and she has always wanted to be with her mum (mum passed away when they were young)