Analysis According to the fact that the total age of all the family members was 58 years old four years ago, we can find that the actual age of each person after four years old is 58+4×4=74 (years old).

But now the actual total age is only 73 years old. It can be seen that the youngest son in the family is only 3 years old this year. The daughter is 2 years older than the son, and the daughter is 3+2=5 (years old). Now the total age of parents is 73-3-5=65 (years old). Knowing that the age difference between parents is 3 years, we can find out the current age of parents.

Solution: ① The age of the whole family from four years ago to now should be:

58+4×4=74 years old

(2) How old is my son now? 4-(74-73)=3 (years old)

(3) How old is my daughter now? 3+2=5 years

④ Father's present age: (73-3-5+3)÷2=34 (years old).

⑤ Mother's current age: 34-3=3 1 (years old)

A: My father is now 34 years old, my mother is 3 1 year old, my daughter is 5 years old and my son is 3 years old.