My sister is 4 1/2 years older than myself. She has always suceeded on higher levels than me- higher grades in school, prettier, taller, married a doctor and lives in a huge home with 3 children, travels extensively etc. I did well in school but never achieved the status she did, married a middle income man who left me for another woman almost 2 years ago, have 2 children who live with me and I adore, live in a modest home that I am paying off gradually. The concern is that I work with my sister and her husband (the doctor) and it has become increasingly difficult to maintain a healthy distance between "family" and "work". My sister wants me and my children to go out to her house every other night. She wants to be aware of all the personal issues that I deal with. Initially I appreciated the support but now I feel that to offer too much can backfire. She and her husband have discussed isssues around me and the children and a few negative comments arose from the doctor to me some time ago. I was very hurt so I slowly retreated from sharing much regarding my personal scenario. Then she got quite upset with me that I had "shut" her out! 
If anyone has similar concerns and have moved beyond this please share some ideas or strategies! I am desparate.