Col payments and theory on how they choose who to pay first

Gazday82

Hello all just wondering if anyone knows how they choose who gets paid first my two brothers live together both have save enitials jw one brother was paid Monday they other got his today and my mom got hers today we all suffer from a rare bone desease and are dussabled I haven't had mine yet like jusy curios how they choose the pay outs 

poppy123456

It's completely random how they pay everyone. I live with my daughter and have always received it on different days.