I am 26 years old married and have 2 kids my question is at my age can I sue my father for child support that he never paid I did not receive any money from him ever... can this be posible? My mother and my grandparents raised me and supported me but because of finantial problem with them they did not afford to pay for my college so I did not go.

No, you cannot sue for child support after you reach legal age. This is something your mother and/or legal guardian should have addressed years ago. In many States there is also no obligation for the parent to pay for the child's college education.