Should I let my Parents Move in with me?

Okay so my parents have been living with my cousins who are older than me with a family of 4 since august of 2010 to now april almost may of 2011 . Both my parents are unemployed my step-dad due to injuries my mom due to laziness in my opinion. My cousins are wanting to kick them out soon. My parents have asked to store some of their stuff at my house which isn't a problem and I asked them where they were planning to go and my mom was like we probably have to go to a shelter I figure this is her way of asking to stay with me I have a family of 5 myself,husband and 3 kids. I also have a small 3 bedroom house if they were to stay with us it would be very crowded because my 2 sons share a room my daughter has her on room and the hb and I have our room. so the only options would be my parents sleeping in the living room or moving my daughter in the same room with her brothers and that would be very crowded. My hb is very against them moving in as am I, I love them its just that seeing how long they've lived with my cousins and haven't contributed towards bills except for baby sitting I feel like it wouldn't be a good situation. I also don't want to see them live in a shelter but they are both able body adults in their mid 40's who should have been able to figure out things in the last 9 months they have had no bills.