Deductions & credits

Hello, I provide full time child care for my two toddler grandchildren, in my home. I am paid biweekly (I left my full time job to provide this childcare ) , thus why I am paid. I pick the children up, transport them to my home , provide their meals, toys, learning activities, personal care then drive them back to their home at the end of their parents workdays. How would I report this income and how would their married , both full time employed  parents report the babysitting expenses?
Thank you , Christine