Full-time motherhood extremely demanding

After putting a lot of thought, I decided that I have to reject a RM75/hour job because my responsibilities as a mother is already too much to handle. But the most important reason is still the fact that I'm not strong enough to risk putting my children in a childcare centre. I'm just not sure if they could survive 8 hrs without me. If only my mum would babysit her grandchildren. Her own flesh and blood. Unfortunately, she's not the type who would GLADly offer her service. She keeps saying that she's too old to babysit. Is 6o years really too old? Well, I'd ask myself, would I babysit MY grandchildren when I'll be 60 years? Maybe, maybe not. Hmmm.....