I assumed that app is more "top" within its category mostly based on installs (quantity and velocity) and user rates and comments. Probably also slightly some other criteria like android vitals score etc.
However, I spotted the app that is #9 in Top for parents with 1.9 average rate (sic!) from 177 users, and only 10k+ installs. All other apps in this top10 are like 100k installs and 4.8 rate.
The question is how is it possible?
Google recently changed its ranking policy creating turmoil
It's quite possible that what you ate seeing is a fallout of that
In the past
The algorithm Google uses is clearly not public for obvious reasons of gaming by app developers but
Google Play help says
Apps are ranked based on a combination of ratings, reviews, downloads, and other factors
I think these other factors and search query wording (apart from downloads) play an important role as explained in this blog
App Name
App Description
Backlinks
In-App Purchase Rating and Reviews
Updates Downloads and Engagement
Some Hidden factors
Try changing the search query significantly to see a different result. Also the same search query from my phone and another users phone yields variations
