[lukasm]

Not sure why you've been downvoted. This is how it works in my country and I think this makes sense.

[roel_v]

Because the topic is not "what's the default legal situation".

[infinite8s]

But if you don't discuss beforehand and come to an agreement, the default legal situation applies.

[cheerlessbog]

If three was a mortgage on the property the payments on the principal are presumably community property, and the appreciation of that post of the value.