I want to evict my old tenants

Sir.. i had given 2 shops on rent ..one shop in year1980 and other shop in 1987. At that time my family was very small.. but now i have 2 sons and a daughter. One son is married and had a boy. My daughter was deserted by her husband and she is residing with us.. i am the owner of the property. I run. One shop ... And my wife runs a tuitions coaching in basement of our premises. My sons help me in running my shops .. we had one small shop which we had given on rent last year. In total we have 4 shops and one basement .. 2 shops are with tenants. I want to settle my sons in that shops but out tenants refuses to vacate it they say we will not vacate the shop in any manner.. i offered them some money which they refused they are demanding half the price of market value ine shop market value is 1 crore .. so they both say that give us 50 lakhs or buy them a shop close to their shop.. i am very much depressed by the behaviour of the tenants .. one small shop is given by me last year and the rent is 25000 . The two old shops rent is 1600 and 1300.. i want to settle my sons and daughter in the shops .. what can i do.. i putt up at delhi... Whats the quickest way out to evict my tenants in short time ...