Answers

Puzzle #1:

The two women are not blood relatives, so from [2], if the doctor is a woman, the lawyer is a man. Then, from [3], the doctor is a man. Because a contradiction arises from assuming the doctor is a woman, the doctor must be a man.

Mr.Horton's son is the youngest of the four and is a blood relative of each of the other three.So, from [1], the doctor is not Mr.Horton's son. Then you know the occupation of Mr.Horton: he is the doctor.

From [1], then, the lawyer cannot be Mr.Horton's mother. So, the lawyer is either his wife or his son. (The doctor may be older than the lawyer.) Then you don't know the occupation of anyone else.