Does Anyone Else Feel Like They Are Taken Advantage Of??

I was a single mom for about 4 years. Then my parents split and my dad moved in (he had a massive stroke 10 years ago so he's on disability and home all day) then I met my fiance and he is here 90% of the time (we live in different cities). Recently, I have started feeling like everyone thinks that just because I'm the mom I should do everything. I was to scream when I come home on a weekend and ask the two of them what they have done all day, and I get the answers of watched tv, or watched movies, when there's a list a mile long of stuff that needs to be done. I've also started feeling like my Co workers take advantage of my willingness to help, taking advantage of the fact that I have offered to be the emergency on call person at the office. My 6 year old is not better. telling me that it's my job as a mom to clean up her messes and pick up after her because that's what Mom's do. Has anyone else felt like this? What can I do to get my point across that I need some time to relax too and I am not a flipping housemaid???