Mmm, I wondered about the timings,too. Although not impossible to conceive so quickly after a birth, it's unusual, and even more so if the child was breastfed (and I imagine he was as choices would have been limited).
Skeletons in the closet? We all have them. I have been surprised and saddened by some of the life stories I've pieced together, but I would never judge my ancestors for their actions. They were living in a different world, with very different opportunities and expectations from those we enjoy now. Women especially had to do whatever was necessary to put food in their childrens' mouth, especially when they had little legal standing and were so very dependent on having a man look after them. Ever read Moll Flanders?!
You need to keep an open mind if you're going to poke around and unsettle the dust that lies over past actions. Firstly, you need to be open to suggestions and lines of enquiry to confirm or refute information that you think may be relevant to your research. Secondly, you need to allow your ancestors their lives, their mistakes and their sorrows, and not judge them against a different age. And thirdly, you need to bear in mind that many things that we'd like to pretend couldn't possible have happened in our families, may well have -- that includes adultery, desertion, madness, illness, and lots and lots of illegitimate children or those born considerably less than 9 months after marraige - and finally, never forget that not every pregnancy is the result of freely consensual sex between adults
