What should I do if my brothers dog is infested with fleas?

So my brother and his girlfriend for whatever reason decided to let my parents dog who we've had for many years mate with another young dog he got. They had like 5+ babies and he kept 1 of them. So now he has 2 dogs that he barely takes care of and not only that but they both have so many fleas :( his girlfriend was mad that i gave one of them a bath once and even the fact that their dogs come to my room when they're not home. Ofc leaving the dogs to other people to take care of. But anyways, so they don't do anything about the fleas, I can't bathe them. Today I was petting them and let one on my bed and he left fleas on my sheets is how bad it is. Poor thing they both are always hungry and lack attention so when I'm around I try to give it but the fleas is where I cross the line. I don't want them in my room at all but I don't know what to do I feel bad for them
What should I do if my brothers dog is infested with fleas?
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