My Dad and step-Mum fostered for 20 plus years but with no other children at home.
Lots of wonderful experiences but lots of negatives also.
They fostered one from the age of 5-25 (SEN) mainly because it was best for him, convenient and cheaper for the LA but also because of the Winterbourne View abuses, they were terrified of him being abused in residential care.
Due to Dad and Step-Mums failing health, he was placed in a 24/7 placement in a house with 2 other residents a couple of years ago. He (foster brother) has managed the transition better than they have and they have him for tea at least once a week and for Xmas day, his birthday etc but it's been incredibly hard for them to adjust to him being in a situation where he isn't being parented like they did, but is a 'resident'.
But also harder and harder with their poor health to deal with his behaviour when they have him and then they feel guilty for being relieved when they drop him off.
They constantly feel the pressure that he has literally no-one else to be looking out for him other than social care, or taking him out etc. They've made provision for him in their wills but their failing health is made worse by worrying about him having no-one after they're gone.
I'm mindful this is a very uncommon situation but they didn't start out as FC thinking this might happen or planning for it, the situation just developed over time. FC can be a huge, lifelong commitment.