Amazing Puzzle

Shilpa is 21 years older than her son raju.
In 6 years from now Shilpa will be 5 times as old as raju.
Question: Where’s Shilpa’s Husband?
(There IS a mathematical solution for this..try it before you see the solution)
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Solution:
Shilpa (MOM ‘M’) is 21 years older than Raju (Child ‘C’).
M = C + 21
In 6 years from now the mom will be 5 times as old as the child.
M + 6 = ( C + 6 ) x 5
C + 21 + 6 = ( C + 6) x 5
C + 27 = 5C + 30
-3 = 4C
C = -3/4
The child is -3/4 year old, that’s -9 months.
Child will be born in 9 months.
So, right now, Shilpa’s Husband is on top of her