It's really hard to create personal boundaries when we didn't grow up with them. My parents allowed me no privacy. There was nothing that was just "mine"; everything was theirs and they would decide when I was permitted to use their property (even my toys and clothes were not really "mine"). As a result it was a shock when I went away to school and discovered that I could tell my roommate what was "mine" and she would respect that. Over many years, I learned to draw my boundaries (what is me and what is not-me), and with my children this was a difficult but very important process. I can recommend it to anyone who is having trouble with children and grandchildren intruding: they aren't seeing your boundaries, and you need to draw them clearly.