Not Always. Please read second example :
https://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=1460&top=14
Example 2
Juan and Lise had a baby in 2019. Juan wants to sponsor his mother. Lise
won’t co-sign the application. Juan’s mother doesn’t have a spouse, partner or any dependent children.
For 2019 and 2020, Juan’s family size is 4:
- Juan
- his partner, Lise
- his baby
- his mother
For 2019 and 2020, Juan must check if he meets the income requirement for 4 persons.
For 2018, Juan’s family size was 3:
- Because Juan’s baby wasn’t born yet, the baby is not included for that year.
For 2018, Juan must check if he meets the income requirements for 3 persons