Receiving Line

Okay another question.
I wonder if it`s okay to just have the bride & groom and the best man and MOH stand in the receiving line? The reason is that my parents are divorced and both re-married (for over 20 yrs). I am very close to both sets of parents. My FIL`s want to be in the receiving line, however I don`t want 8 people in the line with over 150 guests. My parents don`t want to be in the receiving line because they don`t want me to have to introduce them as "step-dad or step-mom". They have been in my life since I was 5 yrs old, they are my parents. Where my FIL`s do want to be in it. I`m thinking of just having the B&G and 2 attendants. Is that okay?