A manager shouldn't have a sibling working with them. They should either work on separate shifts or have separate jobs
I have been working for B-Dubs for 2 years. I have never had a problem with my coworkers except the one young woman. She used to be a server and then moved back to HOH. Now she does more work than she should be doing. We work the opening shift and she holds back on her dishes she uses to setup in the morning. She has to run them through the dishwasher. I do janitor twice a week and do prep 3 days a week. We have another janitor for the other 5 days. Instead of letting the janitor do the dishes brought back from the servers she has to do them. If you are doing them she tells you to get out of the way and you are doing it wrong. I pick on her to annoy her enough so she gives up her dishes so I can do them.
Today I did janitor and just got back from mopping the dining room. I was emptying the mop bucket and she was coming by with the shredded chicken and buffalo sauce in a large bowl that wasn't mixed yet. She tells me to get out of her way. I snapped at her. I told her she could wait until I was done. I told her she needed to stop treating people like this. That one day she might end up like I did. I was homeless for 2 years.
I was a manager at Long John Silver's and have been in food service for 20 years. I am 46 years old and I have seen it all. I used to work hard like that doing other people's job and it got me nowhere. I was even talked to by managers about doing their job when it wasn't mine. It is one thing to help someone out when they are getting slammed it's another thing taking work from them when the place is dead and they are running out of work to do. I left 40 minutes early because she wouldn't give me her dishes. One of these days she is going to take on too much and it's going to overstress her. I have been there. Her sister doesn't do anything about it so not my problem. I hope other B-Dubs are doing better.