I had abusive Parents, who set me and my Half Sister against each other. We have only become friends since my Mother died and we had honest conversations. It only took 50 years.
I know very few families, children now around my age. That there wasn't some level of scapegoating/favoritism/Jealousy. The resentments between Siblings are often ridiculous, but they are valid to the person.
I know families of between five and nine children (quite usual in the Catholic area I grew up in) and none of them speak to each other.
When it was me and my sister, I used to dream of Siblings. I used to look at the families around me not knowing what it was really like on the inside.
A Real Family, as said, is one of unconditional love. Where you support and boost each other.
My DD is friends with Women (20-28) who have come with wider family members from African Countries. I'd love her to tell them they've never had a real family, especially the Nigerian Woman (who is as blunt as fuck on a good day).
Like all Parents, SAHM are individuals, who may or may not be good Parents. They may or may not cook/clean etc, as well.
Your Friend is very lacking in the thinking and knowledge department.