3. What number appears on your mother's, father's and spouse's questionnaire?

Question 3. What is your mother's, father's, and spouse's questionnaire order number?
This question serves to link each child with their mother and father, and each spouse/partner with their spouse/partner and vice versa, notating the order number that they have been assigned on their census questionnaire. Therefore it is important to have correctly put the members of the household in order previously. Now we'll see an example explaining how to ask this question:
The person listed on Form C-1b as Number 03 is named Yaquelín; the Enumerator must ask "Does Yaquelín's mother live in this home?" If the answer is yes, ask "Who is her mother?"
If the answer is Juana, the Enumerator must find the number that has been assigned to her on Form C-1b, 05 for example, and make note of it in the box.
Son/Daughter of Mother ____

The Enumerator will proceed in this manner, asking each person in the Household if their mother, father and spouse/partner lives with them in the home. These should not be confused with people who have said familial relationship and live in the same house, but do not form part of the same Household.
This question is asked with the intention of defining families
The order number is that which was annotated on question 1, in the box following "Person No." before "Name(s) and surnames" (that of the Head of Household is 01 and is pre-printed).
[Figure omitted]

Son/daughter of mother
In this space, the order number (that which appears on question 1 as Person No.), corresponding to this person's mother will be recorded if she lives with them in the same Census Household. If she does not live with them, write "00"

Son/daughter of father
In this space, the order number (that which appears on question 1 as Person No.), corresponding to this person's father will be recorded if he lives with them in the same Census Household. If he does not live with them, write "00"

The mother or father whose order number (Person No.) is annotated on their child's page for this question 3, may have any civil or marital status, as this may include children of single parents.
For stepchildren or adopted children, note the order number (Person No.) corresponding to their stepmother/stepfather and adoptive parent, as applicable.

Spouse of ...
For Census purposes, a spouse/partner is one of two members of a partnership between two people who are either legally married or consensually united in a stable manner. In this case same-sex partners are included, as long as they live together in the same census household.
In this space, reciprocally record the questionnaire number (Person No.) of each member of the couple living in the household, which appears on the line for question 1. If they do not reside in the household, write "00."

[p. 47]

Verify upon completion of Section IV on the questionnaire that the people mentioned in this response who have their spouse or partner's number recorded must also be listed with a civil or marital status of married or united (question 16). If not, the code "00" must appear.
In the case of minors under age 12, this space must be left blank, due to their not having a recorded civil or marital status.

It may be helpful to analyze other examples of the correct annotation of order numbers (Person No.) of a mother, father and spouse/partner.
a) In this example, Luis Pérez Rodriguez (Head of Household) is the son of María Rodríguez Hernández (Person No. 03). Her parents, and those of Pedro Pérez Suárez (Maria's husband and Luis' father, Person 02) are deceased (00). As spouses, "03" will be written in the section for Pedro's spouse, and "02" in the section for Maria's spouse. Luis is not married or in a civil union.
[Figures omitted]
In this example, Marcia Pacheco Alonso is the Head of Household; her parents are deceased, and she is the wife of Mauricio Prats Ochoa, (Person No. 02) whose parents do not live in the household. Mónica Ferrer Pacheco is Marcia's daughter (03), who is 5 years old. Eloísa is the Head of Household's single sister.
[Figures omitted]

Starting from this question, the individual information of each person making up the household will be recorded, asking all questions in order to each person, that is, one person will be asked all of the questions before moving on to the next.