1. Voldemort is spelled like that - not Voldermort
2. I think the answer short accept "Voldemort" - not "Lord Voldemort".
3. You asked for the name of Harry's surrogate family. I think the single word "Weasley" should be accepted. Not "The Weasley Family" in full. Strictly speaking, though, his surrogate family is the Dursleys - as much as Harry and the Weasleys would have had it different. The Weasleys had no relationship to Harry - except they were, of course, great friends.
2. I think the answer short accept "Voldemort" - not "Lord Voldemort".
3. You asked for the name of Harry's surrogate family. I think the single word "Weasley" should be accepted. Not "The Weasley Family" in full. Strictly speaking, though, his surrogate family is the Dursleys - as much as Harry and the Weasleys would have had it different. The Weasleys had no relationship to Harry - except they were, of course, great friends.