Just wanting to stream live football for grandpa. What lap top do I need for him and can he hook up to smart tv?

Any laptop with an HDMI connection will be fine, but why even use a laptop? You can get football on actual TV. And also on a ton of other devices though apps. https://www.nfl.com/ways-to-watch

A Smart TV should have apps built-in or those you can install, or a device like a Roku or Android stick.