In fairness to @Mumof3babygirls, she said she met her current partner when her dd was 15, but definitely did NOT say she moved him in at once - in fact, she said they dated for a long time before he even met her dds, never mind moved in.
@Mumof3babygirls - I agree with the posters who have said you need a firm and direct talk with your 25 year old. And having set the rules, you need to stick to them and not let her walk all over you. I'd also suggest apologising to your partner, and saying you have realised that you've not taken his side when your dd has complained, but that was wrong, and you won't automatically default to defending your dd, when her actions are not defensible.
"Edith - you are 25 years old, and have lived independently, so you know full well that there are chores that need to be done if a house is to run smoothly - and this is even more the case when there are 5 people living under one roof. We all have a responsibility to clear up after ourselves, and to help with the communal chores. You can't just 'chill' on your days off - you need to do your share around the house. You need to pick up after yourself - put your own dishes in the dishwasher without being reminded, do your laundry, tidy up after yourself, AND you need to help with the communal chores - vacuuming, cleaning the bathroom etc. Everyone else is doing this and you are NOT exempt.
If you don't want to live by these rules, you need to find your own place - where you will find no-one else picking up after you, doing your laundry, washing your dishes etc, and either you will learn you have to do these things, or you will live in squalor. But while you live here, we are not willing to enable you any more."
I believe this is what is known as a 'Come-To-Jesus' talk, in the US.