i am a firm believer that it depends on the age. my oldest two were very responsibile, 9 yrs.differents in them & last child.he was always babied.the oldest two, i could trust by the time they were 7 & 8,they were working at 14 & 15. youngest was never left alone until he was 14. your childrens ages to left alone is fine, how are they mature wise? hope everything works out for you.