The Pali is 'sattā opapātikā'. 'Sattā' means 'beings' (plural). The singular is 'satto' ('a being').
SN 23.2 defines what 'a being' ('satto') is, which is, importantly, a state of suffering:
Satto, satto’ti, bhante, vuccati. Kittāvatā nu kho, bhante, sattoti vuccatī?
'A being,' lord. 'A being,' it's said. To what extent is one said to be 'a being'?"
Any desire, passion, delight, or craving for form, Radha: when one is caught up there, tied up there, one is said to be 'a being.'
Any desire, passion, delight, or craving for feeling... perception... fabrications...
Any desire, passion, delight, or craving for consciousness, Radha: when one is caught up there, tied up there, one is said to be 'a
Just as when boys or girls are playing with little sand castles: as long as they are not free from passion, desire, love, thirst, fever, &
craving for those little sand castles, that's how long they have fun
with those sand castles, enjoy them, treasure them, feel possessive of
This is confirmed by SN 5.10, which states the arising of the view of "a being" is the arising of suffering:
Why now do you assume 'a being'? Mara, have you grasped a view? This is a heap of sheer constructions: Here no being is found.
Just as, with an assemblage of parts, The word 'chariot' is used, So, when the aggregates are present, There's the convention 'a being.'
It's only suffering that comes to be, Suffering that stands and falls away. Nothing but suffering comes to be, Nothing but suffering
'Sattā opapātikā' is also explained in MN 12. Importantly, MN 12 differentiates physical birth from the mental birth of 'a being' or 'beings'.
Sariputta, there are these four kinds of generation. What are the four? Egg-born generation, womb-born generation, moisture-born
generation and spontaneous generation (opapātikā yoni).
What is egg-born generation? There are these beings born by breaking out of the shell of an egg; this is called egg-born generation. What
is womb-born generation? There are these beings born by breaking out
from the caul; this is called womb-born generation. What is
moisture-born generation? There are these beings born in a rotten
fish, in a rotten corpse, in rotten dough, in a cesspit, or in a
sewer; this is called moisture-born generation. What is spontaneous
generation? There are gods and denizens of hell and certain human
beings and some beings in the lower worlds; this is called spontaneous
generation. These are the four kinds of generation.
Therefore, a 'sattā opapātikā' is merely a state of attachment or self-view that immediately arises as immediate results of acts of kamma.
For example, as soon as a person performs an ethical action, they spontaneously arise as a 'human'; as soon as a person performs a compassionate action, they spontaneously arise as a 'god'; as soon as a person has strong craving or addiction, they spontaneously arise as a 'hungry ghost'; as soon as a person performs an unethical or unreflective action, they are spontaneously born as a 'animal'; as soon as a person is angry or sufffering, they are spontaneously born as a 'hell being'.
As for 'mother & father', this teaching is not about physical birth but about recognising you have benefactors. In other words, the right view of 'there is mother & father' creates gratitude & the right view that reciprocal or obligatory actions (kamma) must be performed in return towards mother & father and towards any other benefactors, such as teacher, student, employer, employee, etc.