Yes; I’d agree and I say that as a LL who rented a flat to family.
I rented my Zone 1 Central London (Chelsea) flat to my DB and SIL.
It was ostensibly supposed to be for a matter of months (1 year at most) and I charged them half the market rate and bought new additional furnishings at the outset so that they would be comfortable. We also set up a tenancy agreement and of course made sure that all safety requirements were met. In short, giving them the security and confidence that the place was theirs as long as they needed.
In practice, though, the reality was somewhat different! It changed the dynamic of our sibling relationship, which had always been slightly uneasy due to differing material circumstances and outlooks on life. I naively assumed that they’d appreciate the gesture and that it would help build a better sibling relationship.
I thought I was doing the decent thing and helping them out....not making anything financially out of it, but helping them at a time of need. They would never normally have been able to live in that area, and I knew that they aspired to it. They had just had their first DC, so it was all a bit pressing.
They ended up staying over 2.5 years, and in all that time refused me access (to check the state of the windows, which were in need of repair).
Never so much as invited me in for a cup of tea during that time.
Made life very difficult when the boiler required servicing (picked holes in the range of dates suggested) and then refused to sign a new tenancy agreement once the initial year was up.
Most annoyingly of all, I’d see my SIL posting photos on her IG page tagged ‘chelsealifestyle’ bigging up a life that was effectively being subsidised by me.
Made me so annoyed, but there was nothing I could do. DM refused to take sides, get involved.
For the sake of greater family unity, there was no option but to suck it up.
Yes; the rent was being paid on time, but when they finally moved out a couple of months ago there was no thank you or acknowledgement that I’d helped them out.
Left a very bitter taste in my mouth. Never again!