Aliens don't scare Goku as much as his wife. Though the introduction of several new characters has caused their relationship to fall to the background in favor of plot, there have still been moments in the later series that remind us of their connection. She assess the situation and understand her husband needs to do what he's meant to do. Yet, they both very clearly care about each other deeply, they just have trouble showing it. Even though it wasn't what Chi-Chi had in mind, she still looks back fondly on their "first date. Chi-Chi was instantly upset and insulted him, ready to take her anger out during their quarter-finals match.
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He even puts Gohan in the Hyperbolic Time Chamber to seriously train for a year. She can't transform into a Super Saiyan warrior, but she can still fight. Fight me. It's quite interesting when you think about it. Chi-Chi never forgot about Goku or the promise she made him. Brief has made his life with a rough-in-tough, anger-prone super son-in-law work, but Lord knows that Capsule Corp.