What is the main conflict in Harvey by Mary Ellen Chase?

In the first scene of her play, Mary Chase introduces both the family and the major conflict that will be at the heart of the entire piece. Myrtle Mae Simmons and her mother Veta Simmons are two anxious women who are trying to get in the good graces of society, with hints that it is in order to find a husband for Myrtle. However, their main obstacle appears to be in Veta's brother Elwood and his friend Harvey. We hear references made to Elwood's unstable mental state and undesirable friend before we ever meet them. Chase rouses our curiosity and sets up our expectations of meeting these two characters that are apparently causing Veta and Myrtle such grief..... the characters that might keep them from attaining their desire.