Op i think you and your H are going to have to have a talk about unacceptable behaviour in your home / towards your dds and have a plan for dealing with it . This part of your original post is a bit worrying -
first time they were at our house and it was okay, but the boys were quite rude to our dd's and not very respectful of their stuff, but fair enough.
It wasnt fair enough op , and either you or your dh should have said something . Would you have kept quiet if the mum had been rude to you , or disrepectfull of your stuff ? Would your Dh have kept quiet while the dad bashed his beloved power tools or tv about ? Your dds have a right , just as you and your H do , to not have to put up with bad behaviour in their own home and it should have been adressed .
The fact that it wasnt means that this sort of behaviour will probably continue , these boys have took the lead from you and took your silence to mean that your ok with it. As did the parents . You can either raise it and be clear or choose differant freinds who dont let their children behave like this .I would do the latter and simply be busy next time they want to meet.
Either way this sort of thing will happen again and again , bad behaviour will occur towards your dds , either at school or with freinds , one or both of you will have to speak up for them because they are too young to do it for themselves . It is awkward to have to tell off visiting children , no one likes doing it , but the kids were guests in your home and you have a right , and an obligation to tell them not to behave that way . Your dds really shouldnt be subjected to rotton behaviour from visiting kids.