Hi I am nolan , mohawk irsh grand father Lester Patrick nolan grand mother iris Smith
I see a possible marriage licence application No. 26541 for a Lester Nolan and Iris A. Smith in Brooklyn New York in 1946 - is this the same couple you mentioned ?
The place to start would probably be with certificate for this marriage to see if parents are named, also worth checking would be the 1940 US census and possibly the 1950 US census which is due online very soon, April I believe - these should give place of birth, ages etc to which would be good clues ...