Aiigh! Have heard this three times in the past week (from different people, talking about different children/dads) - the first time I thought I'd heard wrong, the second time I made a sarky remark along the lines of "oh no, he's too busy with our son to look after anyone else's children right now" (this was the only time it was about my DP not some other dad), and the third time I just gave up and boggled.
Do people say this all the time and I've just tuned it out until now?