Family and rent

Yes but if your mum moved in a new boyfriend on 60k a year who also owned another property (and let it to some other tenants at market rate and kept all the money from that)... Would that change things?

Well the partner is profiting massively from your generosity

I don't see why you should subsidise the partner. Charge them 800 each.. or they can move somewhere cheaper. It was kind of you to help your sister. Whether you need the money now is not relevant really - effectively you are giving your sister and partner £1400 a month. Which is fine for a sister going through a hard time - less so for an independently wealthy person you hardly know. Oh course there is some benefit letting to family in terms of reduced risk. So there's a balance. But under half the market rent is very low. Is it a huge house?

I actually think your sis and her partner should offer you more, I think they are cheeky if they dont.

But I dont think your oh is unreasonable in asking for more rent since your sis is in a better circumstance now.

I definitely think they should be paying more- it’s the principle and her/ him building up a debt is only likely to breed resentment. He’s on a decent salary and it sounds like she’s in a much better place. You may not need the money now but who knows what could happen in the future and I assume the properties were only bought to generate an income. I’d explain this to her, say that you’re really glad that she’s in a much better place and in a new relationship and that you’ve been really happy to help her out so far but you really need the property to generate an income for the future. Give them the option of either paying the market rent (or at least somewhere closer to it) or finding their own place and you renting to someone else.

Probably depends on how well off you and your husband are and how much your sister is struggling financially. It's hard when it's a sibling and you want them to be comfortable. I think for me the priority would be my siblings comfort. You said one of your properties and if the other properties are bringing similar amounts of money in you're probably pretty well off financially. If that's the case I would let them stay on the cheap rent. If you're not super well off though then would definitely ask for a higher rent, especially with the partner getting and extra income in the rent payments from his own flat. Not an easy dilemma though.

I would have addressed this when she asked you if he could move in.

I would say you were going to put it on the market and see what she says.

Surely they pay each what dsis was paying? Or you are a mug imo.

1500 seems fair.

If you don't need the money, I don't see any need to increase the rent. The market rent is irrelevant, in my opinion.
My mum has been "renting" from my aunt's husband for the last 10 years. She doesn't actually pay any rent at all, only for the upkeep of the property including all the repairs. Everyone seems happy with that arrangement so my view may be biased by that.

I agree with your DH - the circumstances are very different and they should pay more rent. Personally would have addressed it when partner moved in but reasonable to address it now as their relationship is clearly ongoing.