Alright so… "tabletop" is a misleading word in this context, especially since so many people play online these days. I almost got rid of it in my answer but I thought "roleplaying" alone could be misleading too, since it gets used for video games too.
Anyway, the answer is yes, Shadowrun is absolutely a (tabletop) roleplaying game, with or without figures, battle maps and other props some use to play. If I may paraphrase our own glossary (Sodalitas page 2):
[A roleplaying game is] a social game in which we tell a story together by playing characters.
We tried to keep it to the core there, but it really is just this, telling a story, which can take many forms (in some games you don't even play characters but draw a map, telling its story). Basically, if we're talking about Sodalitas, the referee starts by setting a scene involving the players' characters, maybe ask the players a question, so they answer by saying what their characters do, maybe ask questions, then the referee answer questions, maybe tell what happens in the environment, or what non-player characters do (we call them extras here), and then… I hope you get it: it's mostly a conversation, sometimes involving dice to see what happens, and evolving into a story enriched by everyone's inputs.
So you might want to start by reading Sodalitas rules page 2, and try creating characters with your kids—the guild creation can wait after their first adventure. Then you might have an idea for an adventure suitable for these comrades (maybe the brutal vegetarian cook heard about some magical roots in a nearby village? or the fighty brawny noble needs to help a distant cousin with a rats problem in their castle?)… or pick an adventure from Adventures On A Single Page! They're ready-to-play and easy-to-prep adventures fitting perfectly Sodalitas spirit.
Here's the link and lucky you, it's probably in your library already if you got the Bundle for Ukraine: