Statistically speaking, about 50% for each, but in reality it will depend on the father's genetics and timing of conception, pH level of the mother's body, and maybe even some more stuff.
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Since having a child to a child is an independent event (assuming no outside intervention), the probability is still about 50 / 50 boy or girl.
It would depend on the parents' genes and age. Globally, the probability is approx 0.483
It is not possible to answer the question because:the total number of children that the couple had is not known;the gender of the child depends [mainly] on the father, and is not 0.5;the gender of each child is not independent of the gender of previous children.
1:1
The probability of a boy is still 0.5 no matter how many prior children there are.