I like 2, 3, 4!
Albeit it seems over-exposed, or rather it is if you look at the histogram, but i feel it brings out a special feeling! I think it brings out those, warm memories kind of feeling, and you made railway tracks much more than what it is.
You are good, and your cousin is photogenic!
Guys, don't have to be so rigid about technicalities like exposure. Photography is an expression of art, and if you are so 'stiff' and deadminded, kept delving into technicalities, you might as well be a engineer or technician.
Just a my two cents worth!