it was suggested that way, to remove or add members to the family.
"Now there are three sets of mods, where you can have up to 10, 16 or 25 Sims per household. Only choose one or they will conflict!
Now if you want to add or remove Sims from the household, I recommend you use this mod, which is a script mod by TwistedMexi that allows you to do so. My mod just enables Try for Baby in over stuffed households and increases the amount of slots until your household is considered “full”.
Conflicts: None that I can think of. This edits the ITUN S4_03B33DDF_00000000_A73068C2B552CB25 and will conflict with any other mod that edits it. TwistedMexi's Full House mod does NOT conflict with mine. I suggest using the two together for best results.
This mod will work with previous patches and the latest patch as of 10/05/2014. I plan on updating it whenever a new patch comes out, so keep an eye on this thread!"
this was copied straight from mod.
so no idea what is wrong unless it is because of babies made outside of household. I was trying to find out if there was any changes in relationships if they are removed.