John and his wife catherine have gathered their family together for christmas. they have two sons and each of their sons has two sisters. how many family members are there

There are eight family members

I'm pretty sure it's a family of 6.
There's the parents (2) and two sons (+2) 
If they both have 2 sisters that would be another +2... because since both the brothers share the sisters you wouldn't count it as 4. 

Hope that makes sense

I’m going to infer you said parallel.solve for yy= -1/2x+7/4lines that are parallel have the same slope, different y intercept.so we know m is -1/2then from there solve for y intercept.

Heptagon is the correct ans