What should I say to my estranged brother?

My parents always used to favor me over my twin brother and they were really mean to him (they once said that they wished they'd only had me). They'd always buy me things but never him and I used to tease him about it(i know i was wrong but i was young and stupid). When he was 17 he had enough and he left home and I've never seen him since. 2 years on I've tracked him down and he's agreed to meet me but I don't know what I should say to him because I want him in my life.