sitter / helper needed please

To start with I am looking for someone to assist my Mother in minding my Children on a Tuesday.

They are 2 and 4 yrs old. Great, easy to care for Children, just love to play and be messy eaters!

My Mum will be at the house all day but she has a bad back and can't bend and chase them around. She can however prepare food for them and will help watch them. She is fine with my 4 yr old it's more the 2 year olds.