Temple of Ivno increases the chance of having the "fertile" trait; it doesn't make your general fertile right away, so you'll want to stick him in town for a while.
Now, about the 3 kids issue, video games are not that random; if you reset the RNG (random number generator), you'll produce different results. So save your game in winter, send one or two spies or assassins (whether they succeed, fail or die trying is irrelevant) and end your turn. Rinse and repeat until you're satisfied.
One last word; the number of family members is directly linked to your number of provinces, so "cheating" with the RNG might not affect that. It's quite convinient for the coming of age of new FMs though, it saves you from "Son, you shall be called Disappointment #3"...
Of course, roleplaying "Disappointmentus Maximus" can be quite fun too. That's about the time my FMs become fathers that they start getting traits like "gloomy", "likes a drink", "under the weather" and "evil mother in law". Anyone noticed this ?
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