Fatt, thanks for the answer but I get the impression you're mistakenly assuming I'm more or less new to the game. Actually I played through KBTL several times when it came out and completed also KBAP more than once no loss on impossible. I just wanted, after not playing it for a couple of years and waiting for the third instalment, to replay once more KBTL and was intrigued by the idea of getting maximal XP gain. I don't seek the "most powerful" assortment nor am I looking for a really high score (too frustrating trying to do everything as quickly as possible the way loreangelicus did it).
As for the children, KBscanner shows them, so no need to pray I guess. Only I never bothered before to check if getting one kid scheduled with wife A got the kid crossed out for wife B. It appears to be this way, so I won't get the second XP raising kid, at least not in this game. Thanks also for the link, but I know very well which kids are available