Brother gets married, can sister pick up the bride?

My brother and sister are going to pick up the bride when they get married. There were many things to do that day. We must arrange the preparations for picking up the bride in the morning. When my sister comes back from picking up the bride, she should help greet everyone.

Help do a good job of welcoming guests, but also start eating, collecting money and keeping it safe. Wait until the guests leave, but also help to do a good job in cleaning and so on.