lol

He's in bed with the mother XD.

Got it at the 27+y=5y+30.

well what I found out what:

If the mother is 21 and in 6 years her son will be 1/5 of her age, then the son must be less than 5 years old, because I rounded to 25, divided by 5, got another 5, and knew that the son is STILL INSIDE =O

So the father is also inside the mother :P