<human>: So I feel dumb for posting this but I'm not sure how to approach the subject without making anyone mad. My husband (25M) and I (23F) with our daughter (1F), generously opened our unused second floor to my sister in December when she had no where else to go. She just graduated college and needed to get out of a bad situation at our parents house (Our dad passed away suddenly in August and our family is in shambles). We had the conditions of helping around the house (I'm a stay at home mom) and helping paying for groceries and the occasional high utility bill. 

Well since moving in, I can count on one hand the times she's done dishes or any other chores. I made up a chore schedule so everyone can be held accountable. I checked with her to make sure it was ok and asked her if she thought it was fair (literally all she has is twice a week doing dishes and vacuuming). Her response was less than thrilled but it's chores so I just let it roll. 

This was this past Monday (mar 28) and the only thing she's done is half the dishes one day and has dumped everything else on my husband (he happens to be on whatever it was the next day). I've asked repeatedly to make sure it's ok and she gets kind of pissy and passive aggressive and retreats to her cave upstairs. I'd prefer not to start an argument but we're both getting really annoyed and fed up. Her one excuse was "well I'll be starting school and work (part time) soon (she's not working or going to school right now and hasn't been since she moved here) and don't know if I'll have time"....well my husband works full time and I take care of the baby full time as well as going to school soon and we can all do our part just fine. What do I say? My husband says we should start asking for rent money since she won't do what we originally agreed on but I don't feel right doing that.

Summarize the given text in a few sentences.
<bot>: Offered second floor to sister rent free (except help with groceries and occasional high utility). Not helping with chores after agreeing she would help. What do I say? How do I approach it?