My five year old is starting to act like a brat. He thinks everything suppose to go his way and I…

My five year old is starting to act like a brat. He thinks everything suppose to go his way and I suppose to jump when he wants something done. He only started acting this way this week and its pissing me off. I tried talking to him reasoning letting him stay more with his daddy. But still he act like a baby and I am going crazy!! on top of that I take care of my grandfather who try to act like a five year old. he refuse to do things for his self that I know he can do. like now I'm trying to cook so I ask him to peel the potatoes and he gets mad. HELLOOOOO IM THE ONE PREGNANT COOKING CLEANING WASHING N FOLDING CLOTHES!!! so overwhelmed at this point my head is killing me I'm just so ready to have my Lil man!! 5 more weeks to go! I hope I have him at 37 weeks like I did with my first son!!!