Welcome, Dano3456. Your post puts a chill down my spine.
Your sneaky "friends" crossed a line that can never be uncrossed when they usurped your parental authority in regards to family religious instruction. It appears your young family may have been specifically targeted to count indoctrination time as easy hours to be reported back to Watchtower Headquarters.
You should know that children are little more than fresh flesh for these religious vampires. They've already started the grooming process. Most likely they've been showing your kids videos and reading them Watchtower cult litterature behind your backs since day one. It's how they operate.
Without your knowledge or permission, they've paraded your children around like trophies to a bunch of strangers with a long, sordid history of child abuse both mental and physical. As already mentioned, they put your children at risk of contact with unreported sexual predators as well.
It's not enough to put your foot down, or up their ass as the case may be, and tell them no more Kingdom Hall meetings. They will most certainly defy your wishes and continue to "inculcate" your kids with videos, litterature, and age-inappropriate discussions aimed to divide your family and turn your children against you in ways you cannot even begin to fathom.
So, enough with the "free" babysitting.
They have an agenda with your kids, and you are no part of it.
My advice is to cut these people out of your lives like a cancer. They don't respect you now, and they never will.