@Frosthammer
Yeah thank you for the post but governments will be one of the last thing I'll check.
What can I say now is that there might be the possibility to add inc/dil when you change a government, putting the player in front of a choice that might lead to various government policies. Dunno yet.
If you want to check gov effects, just open with PFM DeI1 > db > effect_bundels_to_effect_junctions and check any govt_type line (for government) or political_support (for gov effects depending on political power).
@Waidziss:
if you want dead char not to be showed, there is a check/uncheck box to show/unshow dead chars (top left into family box, named "show deceased"). It works for babies too.
Ok, I've done a pack to limit children spam and it seems to be working, after testing.
It seems now (even if values should bring elsewhere
) that every couple (with high probability by tests) will always have one child only.
I've put % of dead babies to 1, but I'm not sure if this works or not, I've tried with 100 and 50 for a couple of turns with 3 babies and nothing changed, they didn't die. Why? Who knows. 
Anyway, it's more than a month that I'm playing with 1 as % value, and babies died only 2 time (in the 2 texts I've just made
, really, believe me, never happened before
).
So we can say that there is a really low probability that you're going to lose your only child. Well, if it happens, it was meant to be that way.
1st test was for 60 turns, 1tpy, 3/4 couples for generation and this is the result (yellow lines are adopted):
2nd test was 4tpy (1 couple only), they made only one child in 40 turns (who sadly died
), then, at 41st turn, I adopted another couple who made 1 child again. I went till 60th turn again, and no children spam.
From my pov this is surely a good thing and I like the fact that every couple seems to have 1 child at max and always, we can say. Just consider he's the only and rightful heir for that branch.
I've uploaded the pack into OP, with some other minor changes. Just confront it with vanilla/DeI to notice the few changes I've made.
Please test it. Since it mods passive things only, it won't affect anything for 123.f.
And, please, report.