From [1]:
If Lee’s spouse is Dale, then Dale’s sibling cannot be Lee and must be Terry; then Terry’s sister-in-law cannot be Dale and must be Lee. If Lee’s spouse is Terry, then Terry’s sister –in-law cannot be Lee and must be Dale; then Dale’s sibling cannot be Lee and must be Dale; then Dale’s sibling cannot be Terry and must be Lee. Then, in any case, all three of Lee, Dale. And Terry are accounted for and Terry’s sister-in-law is a female. So, from [2], Lee’s spouse and dale’s sibling are both males. In summary:
| |
Lee’s spouse |
Dale’s sibling |
Terry’s Sister in law |
| |
Male |
Male |
Female |
| Case I |
Dale |
Terry |
Lee |
| Case II |
Terry |
Lee |
Dale |
Case II is eliminated because Lee and Terry cannot both be males and married to each other. So Case I is the correct one and you know Dale is a married man. Lee is a married woman, Dale and Terry are brothers, and Lee is Terry's sister-in-law. |
