Would you consider a women a SINGLE MOTHER if she has her sister living with her helping her raise the kids?

My friend lives with her sister and helps take care of her two boys, 7 and 9 years old.

the mother works full time whilst the sister takes care of the house/kids (whilst the mum works different hours cause she’s a nurse) also the sister works a little doing odd jobs for a real estate company working from home.

so all in all the mother of the two kids is primarily the bread winner, paying the rent/bills and most of the utilities.

BUT would you consider the mother a “SINGLE MOTHER” even though she has 24/7 help with her two boys?

by the way she split with the father of the boys and he has nothing to do with them

Would you consider a women a SINGLE MOTHER if she has her sister living with her helping her raise the kids?
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