I work nights. Today at 11 AM (after I had been home and asleep for 2 hours) I went downstairs to get a drink. My 17 year old and 14 year old were still sleeping but my two 11 year olds were watching my 15 month old while my DH went to the store. I yelled at DH because I didn't think it was safe for my 11 year olds to be watching my 15 month old. My 11 year olds told me they know to not let her out of their sight (we have baby gates everywhere) and they know to not give her anything to eat (in case of choking). I was telling this to my mom and my mom reminded me I was baby sitting all alone for a neighbor's child when I was the same age as my twins. I realize this depends on the maturity of the child/ren but overall what is your opinion? Is it safe to leave two 11 year olds home to watch a 15 month old for 30 minutes during the day when a parent is upstairs sleeping?