Young adult children living at home- any rules?

1) Charge them for their keep, not necessarily what it costs, but enough for them to understand that living costs money.
2) expect them to do their own laundry. If their best outfit hasn't been washed in time for the next party. WEll that is their problem and they will soon learn.
3) expect them to clean their own bedrooms.
4) If they do not want the family meals at the family time, leave them to sort their own meals out

In doing this you are preparing them to be able to look after themselves when they do leave home and they have, perhaps, to live with other people.

It is unkind to loose 25+ children on the outside world with none of the necessary living skills.

When our sons were teenagers and started going out with their friends, we would get up in the morning and find a houseful of boys, laying on the settee, in the bedrooms or even on the floor, using the cushions and throws as covers. I always made them a cooked breakfast and because our sons knew their friends were welcome, we never had a minutes problem. I started leaving out duvets and bedding for their friends and now nearly 40 years later, they still pop in to see me when they are working in the area.

We charged our sons board when they started working and put it into a savings account for them (they didn't know about this) then when they were 21, we gave them the money plus extra for their birthday. They didn't want to go to university but get a job straight from school when they were 16 and have now worked to the top of the ladder in their careers. I am so proud of them and I know their late dad would be too.