Birth order
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Birth order refers to the order a child is born in their family; firstborn and second-born are examples. Birth order is often believed to have a profound and lasting effect on psychological developmen
The Marx Brothers in birth order, oldest at top
Three siblings from the 1890s
Primogeniture
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Primogeniture is the right, by law or custom, of the firstborn legitimate child to inherit all or most of their parent's estate, as well as succeed their parent as the ruler of a state.
Birth order
…As more children in a family survive infancy and early childhood, the continued existence of the parents' gene line becomes more assured (cf. the pressure on newlywed European aristocrats, especially young brides, to produce "an heir and a spare"), and the benefits of encouraging heterosexuality weigh…
Esau Sells His Birthright for Pottage of Lentils, a 1728 engraving by Gerard Hoet