You have a good essay here. The following are my suggestions:
My aunt and my uncle are both good people, but I prefer my uncle than my aunt because he is easier, happier, and more generous. My aunt is a mean person, (Change this comma to a semi colon.) she is always scold (Do you mean "cold"?) with everyone in her family. She is a person who is working and talking when she cleans up her house or does something. When she works, her want s everyone has to work with her. (How about, "She is a person who talks while she works, and when she works she expects everyone around her to work along with her.") while my uncle is never do that with anyone in family (How about, "On the other hand, my uncle would never do that with anyone in his famiy.") . He is always quiet when he cleans up or does something, even while he is cleaning house, and everyone is watching TV; he also works with a smile on his face. For example, today my aunt got out (Change to "off") from work earlier than last time and went home first, then she cooked dinner. while (Change to "While".) she was cooking, her husband came home and sat on the sofa. My aunt saw that and got angry. Then she asked him, "Why are you sitting there? Don't you see me what I'm doing?" my uncle quieted (Change to "got quiet".) and did not say anything and my aunt said," You have to find whatever you can work, but don't go home and sit there." (How about changing to, "You have to find whatever you can for work; don't come home and just sit there.") The other hand, my aunt is not happy ones; she does not want to go out, but she just wants go to work seven a week. (How about, "On the other hand, my aunt is not a happy woman. She does not want to go out, she just wants to work seven days a week.") Moreover, she is never want people come her house to have a party because she is very clean, so if people come to her house, she is not happy, she thinks she has to clean house again. (How about, "Moreover, she never wants anyone to come to her house, not even to have a party, necause she is very clean. If people come over to her house, she isn't happy and thinks she needs to clean the house all over again.") While my uncle is a very happy person, he wants invited (How about either "...he invites his friends to come to his house and have a party on the weekend..." or "...he wants to invite people over to have parties on the weekends...") his friends come his house and has party on weekend. For instance, next month, my uncle has a reunion from high school, so they want to organize it at his house because his house is very big, but my aunt doesn't want it there. She thinks if they organize in her house, she has to clean up and that makes her tired when the party is finished. Therefore, she refused and they decided organization (Change to "to have it".) at a restaurant. Consequently (This statement is not a consequence of an action. Change this transition to a more appropriate one such as "also" or "in addition to this...") , my aunt is not as generous as my uncle. When she gives something to someone, she wants to know about what is going on and more detail before she gives it . While my uncle is different ; he wants to give to someone something and he just gives it . He does not need to know how, why, ete (etc.) ... Only one period here. For example, Last (Don't capitalize.) week, her son's sister's wedding was in Vietnam. After the wedding, her sister borrowed money from her friend; my uncle knew that and gave her money to pay back for her friend, but my aunt told him, "Give your money to me and let I (Change to "me".) send it to her." Before I sent it to her, I have to know how much she has to pay to her fiend. (How about rewriting this to, "In order for her to send it, she has to know how much money she owes her friend; this shows how nosy she is."
Make a new paragraph for your conclusion. In conclusion, both are good and (Change to "but") each person has character different (Change to "has different characteristics." . Each character is good and bad sometimes. So, it depends on each situation and in case how should we treat it. (How about, "So, it depends on the situation, how each one will treat it."
You are very observant, and you have really good descriptions in this essay. Good work!