My parents and my own family live separately but not very far. My father got cancer a year ago and is not in good condition, so i visit them very day. My father has always been a very caring father. but not my mother. She thinks that she is our mother (she has 3 daughers) and we should buy things for her. Among the three daughers, i am relatively well-off than my sisters, so i often buy things for her. Sometimes i bought without being asked, sometimes she hinted to me, and then I bought. I do think taking care of old parents is my responsibility, and i do want to spend money on them. I think it is one of the ways to show my love for them. But sometimes i do think my mother is demanding to much. I have bought a lot of things for her, from the big ones like the house (where she and my father live now), the washing machine, the bed, the bicycle, the fridge, the gas stove...... to the small ones like the chair, the clothes, the shoes, the food, the tissue, the gloves, ........ a lot of things for her. Last week, i went to visit my parents, While i helped mom clean the room, i said the mop she is using is too dirty and she should use the new one ( I bought a new one for her a month ago). She said if she use this new mop, i must buy her another one. I was a little bit angry and said that she could buy by herself in the store near her house (only 500 meters away, and my parents have their own pensions) . She immediately became angry and would not talk with me anymore. The day before yesterday,I and my sister went to visit my parents, she talked with my sister, but not to me. Yesterday, I went to visit my parents again, she refused to talk with me. My father has become deaf and half-blind because of the cancer. I want to see him very day. So even my mother didn't talk with me, and showed me a cold look. I still want to go to see my father, but I am really very sad. My mother and father helped my take care of children when they were young. I am very grateful to them. I am trying my best to take care of them . But mother often said something which made me sad. She often told me and my sisters that her sisiter's daugher is such and such good, and what her sister's daughter has bought for her sister. Sometimes she is very unreasonable. My father is very weak. When i told her I have bought father a crane on-line. She said I should have bought earlier. I said nothing back to her. These days, faher became weaker because of the illness. Mom complained that father could not walk well because I bought a crane for him. I really don't know how to deal with her. Whenever i defend for myself, she would became very angry, and sometimes rude to me. In many similar occasions like these, she woould not talk with me for several days, which really made me depression. I would be in a mixed feeling for several days, depressed and guilty until she started to talk with me again. What should i do? Please help me out of this situation. Thank you very much.