Babysitter Needed

We are looking for a great babysitter for 3 daughters in Altadena (ages 4, 3, and 1). Our schedule will vary - but will likely need help on random weekday mornings from 8 a.m. - 12 p.m. I have to volunteer at my daughters pre-school occasionally, but dont get those dates until the start of each session. Would also occasionally love help in the afternoons or a weekend evening! Prefer someone who has their own car, who does not smoke, who is CPR certified and who has a college degree.