Yelling

Aurora and Guy together are trouble.   I don't know how to getthem to obey.  When they are together,  and I ask one to do something,  the other encourages disobedience.
Today  I was trying so hard to be nice.  I kept asking them to do their jobs, and they kept ignoring me and doing whatever they pleased.   I gave them consequences.   I made them take a timeout,  I told them they didn't get lunch,  until the living room was clean,  no results they just kept ignoring me.  Finally I l9st it, and yelled at them.   They finally started obeying,  but I felt awful for giving in and yelling.   I felt like crying.   I want my kids to listen and obey, but I don't want to yell.  Is that asking too much?