Madre soltera o pareja de hecho
Good morning
The answer to the first question is definitely yes, as long as she will be no longer single mother. It wont be automatic, though, it might be that she continues to get the benefits for years but it would be risky anyway.
The answer to the second question is also yes, law varies in each territorie, but precisely if you grant a notary deed you can choose what clauses apply to your relationship.
Regards
Ignasi Tomás
Lawyer
BUFET JURÍDIC INTERNACIONAL VIDAL i CARDONA
Abogado de Vilassar de Dalt especializado en Derecho Internacional
we don't Know exactly the benefits she has as a single mother in order to advice you if them will be affected if you register as a pareja de hecho.
The law concerning pareja de hecho is diferent in each autonomous communities. If you want to explain your specific case we can advice you better. Don't hesitated to contact us for further and specific information