Is East Fishkill a good place to raise kids?

Yes, and I know plenty of people who were raised here. As discussed in some other East Fishkill questions, crime rates are pretty low and a lot of the neighborhoods are quiet, peaceful, and green (and this I know from first-hand experience). Furthermore, the schools seem to be pretty good overall and there's enough activities around to keep the kids entertained.

You could do a lot worse than this town.