This is a tougher ship to pin down than I expected. While Dragon Ball fic is huge, most people tend to stick with the main pairings like Goku/Chichi or explore the bigger, more explosive battles. The 'Chichi x Goku' pairing is canon, so fanfiction often reimagines their domestic life post-Z. I'd start with 'Saiyan Housewife Blues' by SlytherinInk on Fanfiction.net. It’s an older one but does a great job balancing Chichi's exasperation with Goku's cluelessness, turning their bickering into something genuinely sweet. It’s not a grand adventure, more a series of vignettes, but it captures that oddball family dynamic better than most.
Another one I'd recommend is 'Whispered Promises' on Archive of Our Own. It's a slow-burn that actually starts from their first meeting as kids and follows through the series, filling in the gaps the anime glossed over. The writer clearly put a lot of thought into Chichi's perspective—her worries about raising half-Saiyan sons, the loneliness when Goku’s off training or dead. It’s got a more melancholic feel than the usual action-packed fics.