Nannashirlz
My son rents his house out to someone and they have lived in it for 7yrs my son isn’t planning on selling as it’s for his daughters when he’s not here. My dil wasn’t planning on selling her flat but the couple that rent it lived in it for 5yrs and after Covid asked the agent who deals with the rentals if could buy it. I would check out the agents and feedback because my son as had 2 bad agents that weren’t very good.
The problem Nanshirlz is that if your sons circumstances change the tenant has no option but to move out, even if they have been there for 15 yrs! and as you say, your son will leave it to his daughters who might want to sell it to release the money, again the tenant will have to leave.
Many landlords evict so that they can put the property back onto the Rental market at a much higher rent, the amount they can increase the rent per annum is capped, again the tenant has no choice but to move out.
There is no safety net for tenants, even if they pay their rent on time and look after the property and gardens.