Dear friends, as per Canadian immigration website funds required for a family of four are more than CAD 18,000. Does that mean that at the time of landing i have to show proof of having/carrying that money?

Yes

You can bring money into Canada in the form of:

*cash;

*securities in bearer form (for example: stocks, bonds, debentures, treasury bills); or

*negotiable instruments in bearer form (for example: bankers' drafts, cheques, travellers' cheques, money orders.)

If you are carrying more than CDN $10,000, when you arrive, tell a Canadian Customs official when you arrive in Canada by filling and handing over a one page form. If you do not tell an official you may be fined.

You can find additional information and ideas on bringing or transferring money into Canada here:

How do I bring money into Canada (proof of funds)?
http://www.settlement.org/sys/faqs_detail.asp?faq_id=4000258