I think $12an hour is very good especially if you can take your kids along with you. Is the salary gross or net? Tell her why you are doing this temp. and emphasise that that your children will not interfere anything as you have a back up for your kids if your kids fell sick( which you already did but say it again as I'm sure her concerns would be how would you handle if your kids are ill or will her kids get enough attention when your kids are around). Can you leave your kids to your back up once in two weeks for example? If you can tell her that you are planning to do that too time to time? Well I hope you will get it as it seems a perfect fit for you. Good luck.