It's in part at least...a 'normal' Italian thing. There's alot of showing of emotion in the Corleone family, and though Michael's to Fredo is definitely the most passionate (I mean that in the sense that Michael is heartbroken)...we DO see other instances of male family members hugging/kissing throughout GF and GFII.
Also, considering the moment it happens...it may just be a signal from Mike to Fredo that he's in big, BIG trouble for having been discovered as the traitor to the Corleone Family.
Apple
A wise and frugal government, which shall leave men free to regulate their own pursuits of industry and improvement, and shall not take from the mouth of labor the bread it has earned - this is the sum of good government.
- THOMAS JEFFERSON
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