busybee if your friend is the mom of the twins it is perfectly ok to have them over for a play date :)
The way the law is worded is that 2 or more caregivers cannot get together on a private premises unless they only have 5 children under the age of 10 combined (and only the children that live on the premises are excluded from the ratios), but a caregiver and 5 moms with as many children who are theirs can visit you or you them is not illegal.
I think the DNA needs to be updated, the DNA was developed when home daycares were basically all babysitters, there was limited programming becasue most were relatives or friends watching each others children. But times have changed and so have many home daycares. There are still some who are considered babysitters in my eyes, or some who are just caregivers meaning they do a little more than ensure the needs and safety of the children are met, but they don't have a program, structure or routines.
I see more children being injured while in the care of their parents than in caregivers. Parents are stopped from having play dates? I have some friends who have 4 - 8 children of their own and if they get together the two moms could have more children than me (but will admit they do have older children;) in the mix ). It is unfortunate, but unless we all get together and petition the government I can't see anything being changed :(