AllMovie

Rob (Dick Van Dyke) and Laura (Mary Tyler Moore) have always been proud of the fact that their respective parents have never been "intrusive" in-laws. All this changes when the elder Petries and the elder Meehans each buy a separate family cemetery plot -- and both Rob's and Laura's folks expect the couple to "share" their respective plots when the time comes. A huge family squabble erupts, whereupon Rob comes up with a brilliant solution (after first vetoing the notion of inventing a "longevity serum").