Looking for brother who may be in Minnesota

I'm looking for a brother who was adopted in 1970/1972 this adoption was in finalized in Clinton Count. He was born in Lansing Michigan on 2-26-66 with the name of David Eugene Hazel. We are his sisters and we don't know if he knows he is adopted or not, most likely he does. We only want to find him and make sure he is well and alive. Please if you have any information, or any advice for us, post or e-mail me I would deeply appreciate it. If "David" you ever read this...and decide not to contact us, please know we love you and have never forgot you. Love your sisters