 Meanwhile , Brian tries to join Peter 's group , but Peter says it is not a good idea because Quagmire dislikes him . Brian attempts to rectify the situation outside Quagmire 's house . However , Brian ends up making things worse by mistaking Quagmire 's sister , who is hiding out from her abusive boyfriend , for one of his dates . Brian tricks Quagmire into going to dinner with him by making him think Cheryl Tiegs , Quagmire 's long @-@ lost love , is the one inviting him . 
