Partner's teens are slobs

I (m43) recently moved in with my partner (f46), of a year. She has an 18 y/o and twin 16 y/o's. I have 2 boys (3 & 5) that I have 50% of the time. I'm going crazy here... We spent most of our dating time at my place, so I didn't see her kids much, but when I did they seemed pleasant. She recently bought a new construction home and we all moved in together... Her kids are beyond lazy. They leave all the cabinet doors open, their cups and plates out on the counter, and food out to spoil. Rooms filled with dirty dishes. Bathrooms trashed. Mountains of dishes in the sink. I was not raised this way. I had an Army Dad. I appreciate his upbringing now, maybe not back then... It made me a very responsible, successful man. They spend hours on hours playing games on their phones. One son plays 8+ hours a day, every day. No one does anything around the house without being told, and even then it's a fight. No one works. They Doordash drinks and food to the house with money I have no idea where it came from.. I'm ready to move out and it's only been a month. I feel like dealing with her kids every day makes me a bad Dad to my own kids when I have them half the tiem. I wish it didn't frustrate me, but every day I'm mentally drained from feeling like these kids are lazy slobs who will never leave this house. One has already missed 4 days of school in 3 weeks, not from sickness, from staying up all night playing games...

Please help me before I lose my shit and have to move my two young kids again.