It isn't quite like that. While it maybe true that no community can claim to be more family oriented, the way family works can differ.
Take white, north american people of european descent. We have a history of having our kids strike out on their own at a certain age. We expect it. Chances are that many people of European desent have and know family members that have left their families to find a better life or just to start a better life. I have family all over the place.
But in certain cultures you never leave the family or the community. An example is the Inuit. You are expected to be a productive member of the community and you help provide. Leaving to join the CF isn't something you would consider. What we try to do in the CF, is sell the CF as a way to gain skills that you can bring back and benefit your family and community. But it's a tough sell.
In other cultures, parents are happy to keep their children around as long as they can. Or you don't leave until you are married and so on. These are cultural aspects that come into play and family is a huge part of it.
In Canada, we had two entire generations that went to war. It wasn't just the army that went to war. The whole country did. Their sons and daughters, many of them joined in their wake and so on. A lot of serving members proudly point to various family members that have served. There is a history there and the perception of military service is different.
The thing is, that a lot of newer Canadians don't have that link. It's not to say they aren't any loyal or proud but military service can be seen differently based on family and cultural history.