If they are True Blue witlesses, then they will grow true to breed: In all things they will know the cost of everything and the value of none. MONEY is always the bottom line.
Stop giving them money, because now they are presumably independent, it is not necessary to do business with them by giving them money.
This one will hurt: Don't buy them or any of their children presents, don't ecourage your grand children to associate with them. Tell the children about all the horrible things Jehovah does to people who don't want to be nasty like the JWS.
HB (of the "Heart Broken class")
OXO