not all parents are perfect, parents are humans too.. and shes a mother so i bet she said that from all the stress shes dealing with taking care of them and working at the same time.
of course they make mistakes too but that's not a reason they should say those things, like what i said the words they say can have a big impact to a growing child's personality which will affect not only the kid but also the people around them. you can see how her actions did a negative effect to the kid's emotion. she's stressed yes, but she shouldn't have raised her voice on a KID. you chose to raise three kids while working you should have atleast treat them with what they deserve
what is their mother saying?? he's a child they're both the same age a year is not enough for a kid to mature and you expect the kid not to act childish just because he's the 'older brother' you can't just push a responsibility on a kid if you can't do yours properly you don't even know how words can affect a growing kid's personality.
i don't hate the mother but what she said to the second child is really disappointing
http://www.mangago.zone/read-manga/yuzuki_san_chi_no_yon_kyoudai/mdx/d_v-1-chapter-2/18/