Answer:sibling rivalry
Explanation:
What is sibling rivalry?
This is an animosity and fighting between sibling that occurs due to the arrival or birth of a new child in a family .
The first child or older child may feel a bit of jelousy for this new born child and this start as soon as the child is born.
The older child may feel like their parents like this child more than they love him or her because of this they may act spiteful towards their sibling .
To them this may feel like the only way to take out these frustrations by being mean to their siblings.
Most of the times they do this because of their level of maturity hasn't real reached that stage where they can understand that the love of their parents can be split equally hence they don't do this because they sincerely hate their siblings; which may be the reason why Ethan regretted at the end.
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The law of segregation is Mendel's law which explains that traits are passed from parents to offspring individually instead of as pairs, groups or sets. However, this law and the laws mentioned above, minus the principle of genetics, are all part of Mendel's Law of Independent Assortment.
