Wait a minute, the fact that I have a grandmother implies that she reached adulthood to reproduce! How can she be an undead rotten zombie fetus?
As for your comics, technically there are few flaws. However, your jokes don't seem funny to me. The jokes seem to all end with something dying or the threat of something dying, and obviously it gets old after too many shots (and if I didn't like those kinds of jokes in the first place, that makes it all the worse).