How to report payments to grandparents for babysitting our kids and they accrue social security credit

My parents are babysitting our kids this year and we will be paying them annually ~12K. My parents live with us and they are  73 years old.  I see that nanny tax doesn't apply to parents, but they  would like to report this income and  pay FICA tax to accrue SS credits for them because they don't have 40 credits yet(recent immigrants).

 

1) What is the best way for  me to report this payment in my tax return and how should my parents report it in their return to acrues SS credits?

2) Can I claim dependent care credit for the money paid to my parents for child care?