Can anyone tell me if there was an episode where a boy who the Miller's thought was interested in Lauren turned out to want to date Brian? I think I saw this...or was it another series? Can you tell me the episode's title...

Am I wrong

Sounds like another series.

There is an episode called "Still Parading" where a guy wanted to go out with Brian.

It was on Still Standing where Brian built a parade for school and Fitz's son asked Brian out. Like MarshallMathers said, the episode is called "Still Parading".