Should I move in with my boyfriend's family and pay rent?

As many of you know, I’ve been with my boyfriend for 4 years and we are serious, meaning we plan to one day marry and have kids. He’s 25 and I’m 26. Some of you know I stay at his house a lot but I go back and forth between my parents’ and his place. At our age in Asian culture it’s still pretty common to live with parents if not married.

Anyways, he lives in a house with his sisters and one of their boyfriends. It used to be his moms but she got married and moved out. House was supposed to be my boyfriend’s but all his sisters moved back in after relationship issues in the past.

For a while we have been talking about getting our own place but it’s hard when my job is kind of unstable but I’ve been saving money and him going to school is a lot of money. We are so tired of cleaning up after his sisters. We clean their dishes, put them away, throw away old spoiled food they leave out and in fridge, take out trash, cut grass, buy groceries, and I’ve cleaned the bathroom.

So last night my bf and I were completely shocked when they called a meeting and said we don’t help out enough. We explained how we have done so much and they just brushed over it on to another “issue” saying we never help buy toilet paper and other essentials when running low. My bf defended me saying I do that stuff. It is the truth, but I haven’t recently because I haven’t seen it ran low because I always see it in stock. So we said if it’s a problem let’s make a list of things we run low on and they’re like “I don’t think that’s necessary you should be adult enough to know” as if we’re psychic. They feel like they shouldn’t have to announce it.

Anyways, also they want me to pay rent now too. $400/month. I understand that and I believe that is fair, since I’m there a lot but I seriously wanna move out but I’m only there if my boyfriend is there. Do I really wanna pay rent for a place where nothing is mine and I have no property like clothes and such there when I can stay at my home and save money for a place?? My parents never made us pay rent so I can save money easier And maybe stay at my bf’s on weekend.

so bottom question:

1. They think my bf and I don’t do much around the house when we feel it’s opposite. They don’t even want to compromise on how to fix things, what do you suggest? We kind of “process” things differently.

2. Should I pay the $400 a month just to be with my bf for a place I want out of? Or is it better to stay more at my own place with parents (whom are never home) to save money for an apartment/condo next year?

At this point my bf I want to make it an early push next year for our own place. Last night he said he was tired of dealing with their stuff.. Maybe it’s just because having 5 adults is bound to clash. They have pissed me off so much on other stuff, this is the cherry on top to say I don’t help out. At least he’s on my side…