WIY, D9, Yes there are other options like the husband going to work so the wife can raise her own kids, lets start with that.
And there are other options. When I went back to work when my youngest was a baby and I lived in Flatbush I did not give my Housekeeper a key. I told her she can take my child outside only on the block and in the backyard (where my neighbors could see her). Why anyone allows their babysitters to have a key to the house and lets them take their children anywhere is beyond my comprehension. How do you know that they don’t take your kids to a treif restaurant? How do you know that they only take your kids to the park? How do you know that they only walk with your kids and don’t get into a car with them and go off to their boyfriend’s house?
It is one thing when the kids are old enough to talk and tell you everything that goes on. It is certainly another when kids are too young and too small to give you feedback. DO NOT GIVE THEM A KEY. Let them take your kids out in your backyard only or in front of your house. Who said they need to walk? If the kids are in carriages let them walk them up and down in front of the house. YOU take them for a walk, or take them to the park when YOU are home. Or get a High School student to come after school to do it.