I may or I may have not converted my younger cousins into gamblers

So... I was staying at my cousins' house for a while because the wifi in my house disappeared. Everything was normal until the second day, where they noticed me playing bandori. They asked me, "what game is that? i want to download it!". I was so happy that they took an interest in bandori, so I immediately taught them how to play it. It was tough at first, since it was their first time and all, but they got used to it.

Everyone knows that if you play bandori, you need good cards. My cousins asked me about the cards and I taught them what "gacha pulls" are.

Big mistake...

They now ask me to farm their stars so that they can get their best girls (keep in mind that I have two cousins that play bandori). My dead hands can barely handle playing bandori on three devices, including mine. Everytime they get enough stars, they do a gacha pull, and those gacha pulls usually only give them 2 stars. They'd cry over it because they didn't get a 3 star or a 4 star and now I'd have to farm more stars... again...

help i don't know what to do