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I think you forgot that MC is still a kid as well. She maybe nearing 20 but that is around 18-19 in international age plus she has been working for we don’t know how many years for her siblings and take care of them.
Yes the twins are younger and do not know better. They might not even know as to why their mother left. But MC is pitiful too, She forced to be a teen mom. So let’s understand both sides since both are hurting.