pariente político
A relative by marriage rather than by birth — kinship acquired through a chosen union.
An in-law in a dream is the dream's image of kinship acquired through the choice of marriage rather than the fact of birth. In-laws are family by virtue of someone else's decision; the relationship has all the obligations of kinship and none of the original glue. The dream brings the in-law when a relationship in your life — a colleague's family, a partner's friends, a new tradition you have married into — is being navigated. An in-law approached with respect is the dream telling you the borrowed kinship is being honoured. An in-law experienced as alien is the dream noting that the obligation has been assumed and the actual relationship has not yet been built.