The best thing to do is get a copy of the local pet and animal laws. Regardless of peoples biased opinions and unfounded fears, you can legally own them. So, if CPS shows up, show them Fact Sheets on the species, as far as how big they will be, show them a copy of the laws, which will basically only state which species, if any are banned, or require permits. Tell them there are no documented cases of BP's killing a person. Show them that they are kept in secure enclosures. You can probably find some statistics that shows more people will be seriously attacked by dogs than snakes. And, depending on the temperament of your snakes, even offer to handle one in front of them...
Rob
P.S. It would also be a good idea to check your local and state laws first to make sure you ARE in compliance with them.