NC 
in case you all come after me with pitchforks for being heartless!
Split for 5+ years. amicable. I left him in the housing association 4 bedroom property as he couldn't privately rent as easily as me as he is disabled and lives on Pip/esa etc, the kids used to stay 2/3 nights a week depending on what was going on but this has dwindled down to maybe 2 nights a month by eldest who finishes work at midnight and doesn't yet drive. He can't manage the garden himself and has to pay someone to cut the grass etc, he also has to pay bedroom tax from his benefits and only turns one heater on because it's too expensive to heat the house.
I currently live with 5DC, 20 miles from school in a lovely but very expensive to run and impossible to keep warm private rental, work from home: so I have 80 miles a day in a car dropping off and collecting kids around work calls and meetings.
Exh lives literally next door to the school, alone, barely uses his bedroom upstairs as he struggles with the stairs and often sleeps on the sofa.
kids only stay there when they need to be in town (ie working late) and I am expected to do all running around as 'he can't drive at night' and doesn't ever offer during the day either.
How do I approach that the best solution to this is that I move back into the house (still joint tenant) and he moves into somewhere smaller (he wouldn't need bedrooms for the kids as they don't choose to stay there- they have to out of necessity sometimes, but have all said they would visit but don't need rooms if we have a house in the town)
I would be willing to pay for removals and setting him up in a smaller place etc, but am I being a total bitch for wanting to actually utilise a house the right size for my family when there is no other available properties (we've been looking for 3 years!)