Cherry You don't say exactly how large your family is, but something to consider is that you are setting a precedent.
This is your first grandchild and presumably there will be quite a few more in years to come. You will have to be fair to your other children and if you have childminded for this one, the others will probably expect you to do the same for them.
If you're not careful you could find yourself childminding till you shuffle off this mortal coil, not to put too fine a point on it.
How does your husband feel about looking after this grandchild by himself?
There is no reason why he shouldn't stay at home with DGC, being the one in charge, and all that that implies, while you do the gardening, go on courses, pursue new hobbies, chill or whatever.
Is there?
Do you still wear you original wedding and engagement ring