I like to name the children after their grandparents, so their first and second names are the same. Will that corrupt the 'hood or am I fearing something that isn't a fear at all?

I dont think thats a problem at all.

Not a problem at all. Sims are identified internally using various unique numbers; the names are for your benefit only.

Thanks, I'm happy with that and continue naming them after eachother

no it will only confuse you if something sim related happens

if for example you have 3 generations of Rose Pettle (and none of them are in sight)
and you get the message Rose has done......... , who is the one related to the action?
there is no picture with it to tell you which Rose did that thing

I happen to know 2 with the same name from the townie class
both were visiting and made playable for a while
then one of them did something stupid
and I still don't know which, I had to turn them back to townie class to get rid of that

Perfectly fine. I have male and female versions of the same people in my hood, and the only trouble I've had is when there's text-only options. Like once I had one sim influence a flirt on the wrong sim because there was no picture. REJECTED.

This is actually quite interesting with Townies because in one of my machinima series, it deals with all of the "children of the townies" without DIRECTLY mentioning it. People just kind of picked up on it around episode six. So what I do is, if there are two sims with the same last name, I relate them based on their ages/genetics in a way that makes sense. So Marylena Hamilton, the deliverywoman, and Marylena Hamilton the teenager are related - the deliverywoman is her aunt and Marion Hamilton is the deliverywoman's twin sister who had the teenaged Marylena. I know, confusing x'D But I like to think in that case that Marylena was a fashionable name at the time, verging on classic - and that Marion was so close to her sister that she named her daughter after her.