As far as I know no one has commented on the fact that when a regent invests
his/her heir with the regency that that normally leaves the former regents
spouse as blooded and the former regent as not.

Logic says that both bloodlines go if its a retirement simply based on the
size of the egos involved. A blooded spouse might overwhelm a non-blooded
one simply by their presence I suspect. Most relationships can not stand
this so either both divest or neither divest.

The spouse divestment is a good way also to reward unblooded or low blooded
henchmen. :)