In-laws & outlaws

CSP & I had to write autobiographies for our adoption home study.  There were lots of questions to answer about our families.  One question CSP & I debated about.  It asked about our in-law relationships.  If they get along etc.   CSP thinks that it is a rarity for both sets of parents to come together after a wedding and be social with each other.  I know lots of couples whose parents all get together at birthday parties etc and get along very well.  Our parents live an hour apart so they don’t really see each other.  So settle this for us.  If you are married or committed, do both sets of parents socialize together at holidays and events?  Or do they never see each other?