Form AN Queries

[jasb_003]

Hi,
This forum has always been very helpful so first of all thanks to all the forum members.I am in the process of filling up the form AN for my Father who qualifies for naturalisation on basis of marriage to british citizen.I have a few queries which are as follows:
1.The form asks for address for last 5 years however people married to bc qualifies after three years,therefore do they also need to provide overseas address to cover full 5 years or they just provide last three years address.
2.What to write in the form if the applicant is not working at the moment?Does it have any effect on the application?
3.The form asks for parent details of the applicant.Is it mandatory to fill those details?
4.If the person is over 65 now do they still need to provide esol certificate which was submitted at the time of ILR application?Is the esol certificate enough or there is something extra which needs to be done for citizenship?

I would be very thankful if somebody could provide answers to the above.

Thanks